Louis,
I think Brian has it right. But since you don't hunt, I would suggest taking the gear out somewhere where you can simulate a hunt and put it to the test. If you took the day scope and Patrol along and "pretended" they were rifle mounted you could do it in a park, wildlife management area or refuge, relying on critters to play the roles of malcontents.
For daylight use, the thermal is fantastic as a spotter, but only fantastic as a spotter. When the target is even partially exposed you will have thermal returns that will alert you to the need to investigate with a good day optic. In addition, if it is a shooting situation, a good day scope will provide a lot more information than a thermal is likely too, allowing for a successful shot. For example, a well camouflaged target of interest hiding behind anything but a solid screen of brush, terrain, building, etc, will be revealed with the thermal, but the return may be just a sliver or a couple of splotches which are unrecognizable as a target until investigation with a good day optic reveals, say, an antler tine, flick of an ear for a deer, or the strap of a day pack, glove laid on the ground for someone laying in wait, etc, etc, etc. As I described earlier, with a good set of binos I could pick out a bullet path to a nearly obscured deer, and could have transitioned that view, that bullet path to a day scope - but not to a thermal scope since even in the best conditions some brush and other intervening vegetation may not to be visible through thermal.
In low light conditions, you would want very good day optics but as light dims even the best binos or day scope leave a lot wanting. And that is where the thermal reigns for both spotting and shooting. (Mini binos, even the very best, don't cut it. I have 8x20 Leica binos, and can attest to their handiness and usefulness in bright daylight and their quickly diminishing usefulness as light wanes.)
You cannot compare even the best NV with thermal. Nothing living hides from thermal if it is partially, even minimally exposed. What it is might be a difficult or impossible question to answer relying on thermal alone if its presence is only revealed by a sliver or blotch of return, but you will know it is there. In night time shadows even an elephant can be invisible to NV, at least without the use of IR, which has the potential to not only give away your position, but to reveal what tools you have at your disposal, like NV. Thermal gives away nothing.
I strongly suggest you try the Patrol as a clip on. If it works it would solve all of your issues, you would use it as a spotter and could rapidly weapon mount it in front of your day scope for night shooting. Carrying the Patrol as a spotter, but ready to weapon mount is no challenge, there are a plethora of MOLLE pouches which will fit a USMC war belt, and the same with regard to a duty style belt. When I night hunt I carry my Patrol in either a jacket pocket if I'm traveling really light, or in a pouch on my left hip if carrying spare batteries, mag, water, etc.
[FWIW, I have a predator hunting bud who very successfully uses clip on thermals in front of a day scope. He does not own a dedicated spotter and uses one of his spare clip ons as a spotter. As easy as his clip ons are to weapon mount, for your purposes it would be easy to transition a clip on from hand held spotter to weapon. I have never tried the Patrol as a clip on, and have heard that zeroing it can be a pita, but it can be done, and the directions on how to do it are provided in the flip through quick guide that comes with the Patrol. The D-Loc mount would make a fine QD mount for a clip on as well, the Wilcox less so because of the necessity of leaving the base on the rifle.]
On the D-Loc weapon mount for the Patrol, nothing about the D-Loc mount interferes with using the Patrol helmet mounted. Moreover, the D-Loc mount is a QD mount, and is about as quick and easy to use as the Wilcox weapon mount, it might be perhaps a tad slower to mount the Patrol, but a lot quicker to remove it from the rifle.
Here is a photo on my Patrol weapon mounted as a scope. You can see that the dovetail shoe is on the opposite side of the Patrol, and is ready to be used to helmet mount the Patrol. I use a somewhat smaller, but very similar D-Loc mount to weapon mount a PVS 14, and still wear the PVS 14 as well for example.
I really think you should follow Brian's advice and get out in the field to try different set ups with your gear, it really is the only way to determine for sure what works for you.
JPK