Granted, you’re using a home setup. But you could still consider setting up the VPN on a central AP and repeating your hotspot through it to make everything going in and out of your network encrypted and more secure. None of your actual traffic (besides what your phone is emitting) will be in the clear, which is better than nothing.
Almost any router with VPN and repeater options will accomplish this if you don’t wanna root your phone. I’ve flashed OpenWRT on the equivalent of router potatoes over the years. It’s pretty straightforward.
Localsend has a config named ‘auto-accept’ or whatever it’s called, in advanced settings.