I would stay away from ATN. There a lot of trade in PVS-30’s, -27’s, and -24LR’s on the market that can be had for the sub $5000 price range. Any of those should serve you well for your intended needs.
I do some yote hunting, sitting and calling to date. I have them in the back yard, and if I could move the NV to the .22 I’d be able to take some there too. For hog hunting, don’t know as I’ve never gone. But want to.
If not clip on, what’s the next option? Can I move from one rifle to another w/o re zero? Can I remove from rifle and use as spotting scope for wild life in back yard?
You also have head mounted NVG’s that are more suited for scanning, navigation, and short to medium range engagements. If you have rifles equipped with NV compatible optics, you can aim passively through your optic with your NVG. You can equip your rifle with an IR illuminator for low ambient light situations. You will definitely want an illuminator.
Also consider thermal optics. You will be surprised how hard it is to detect animals at night with NVG’s. Unless you’re willing to spend $15,000, I would go with a dedicated thermal optic instead of a thermal clip on. I’m not even sure there’s many options for thermal clip ons in the sub 15k range.
Clip on’s are very niche and I don’t know if I would recommend them for your first intro into NV. They can be mounted in front of spotting scopes with the appropriate mount.