This was over on the F3 forum but I think it applies to any of the models with limited access to the rear tire valve stem (for both checking tire pressure and inflating).

In a previous post I can't find any longer, Blue Knight had suggested a product from Kurvy Girl. It's an 85 degree valve stem designed to be installed permanently in the wheel. I think I've found the product here; https://www.kurveygirl.com/shop/prod...irlhpffdk4u1u1

It does require removing the wheel and tire. BK had drilled a new hole 2" inboard of the brake side of the wheel so it doesn't interfere with tire mounting tools but is still more accessible than the OEM one (which he kept in place). Maybe he could post again in response to this the details of his solution.