Solar Powered Wifi Camera with Wireguard

Hello --

I know this is not a 100% fit for this community and I apologise - but I don't really know where to ask best. There's some selfhosting involved, so maybe the smart crowd here has some recommendations.

Here goes:

I want to mount a camera at a quite remote location. I have Wifi there that I can use (I pay for it, but its usage is shared, I don't monopolize it). I do not have power there. It's outside, mild in winter, quite warm in summer. I will not get there for months at a time. I want the camera to be private, not open to the world. Ideally I'd like a solar powered wifi camera that can connect to my home via Wireguard (I have that bit going, multiple roaming notebooks and phones connect to home, terminated in an Opnsense router).

I do not need any specific smart features on the camera - PTZ would be nice, but not even fully required.

I can come up with a configuration that involves a Raspberry Pi routing an off the shelf camera via a Wireguard tunnel, or similar, but that doubles the power issues I need to solve. I am not opposed to DIY a solution, but there's the challenge of getting it well packaged in a waterproof way.

Considering I can't really touch the wifi setup (cheap commercial router), I don't really see a way to have a private connection without having some sort of a VPN (I could do others than wireguard in a pinch).

If you'd like to help me chip away at one or the other bit of this problem, I'd be very grateful.