I hope somebody who knows better will correct me if this is bad advice, but I think you'll need an
Inspire 2 to loft a thermal sensor and it won't be cheap. The
Inspire 2's got a gimbal that will take a FLIR, and there are a few options plus DJI's dual camera.
There are also the concerns of The Editor about export of the tech, and I've needed to get on the phone to get pricing about thermal cameras.
I'm saving up for a Mavic 2 Dual, which at something less than $3000 might be the best deal these days for a thermal sensor with reasonable resolution and features. I bought a Parrot Bebop Thermal, found it's a joke, and sold it on eBay for less than 1/3 of what I paid for it, only had a couple bidders.
Meanwhile, I settled on Yuneec Typhoon H + CGO-ET as the lowest-priced thermal rig and it's very low resolution. The CGO-ET gets thermal plus low-light images in the same video file so it's an easy edit to overlay the low-resolution thermal over the HD visual.
I don't think there's a thermal option for the Inspire 1, might be something if you add the X5 gimbal option or get an Inspire 1 V2 but I haven't found it yet.
Can anybody add to this?