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FWIW, I've been "night hunting" since 2000 and along the way have used kill lights, Digital Night Vision and have Thermal Optics in Resolutions of 256, 384 and 640.
I probably have more than 500 kills using DNV and Thermal in the last 10 years.
IMHO, you will not be happy with a thermal clip-on mounted on the rig you describe in your OP.
You want a dedicated Thermal optic. These days most have a mount that is quick detach and return to zero and have different profiles that allow one to pre-zero for different distances or other rifles.
Both thermal and Digital Night Vison have their strengths and weaknesses. That is another topic.
I have found these guys to be credible and they have 417+ episodes discussing the topic night vision and Thermal. They don't show a lot of kills. Rather they educate one as to what the pros and cons of the different optics and what each optic or class of optics and who that optic is good/not good for.
Episode 373 discusses Clip-ons.
The episode 96 discussed in the vid above....
ya,
GWB