Not many apps support remote (bunker) signing yet, but a few do, like Coracle, Jumble etc...

I haven't started using this one in earnest yet, but I had the previous one, which I wrote an article on here:

nostr:naddr1qvzqqqr4gupzp6pmv65w6tfhcp73404xuxcqpg24f8rf2z86f3v824td22c9ymptqqxnzde4xvunqvekxqergv35vvrnr3

If you're looking for a universal, complete, bug free solution, we are not there yet, but if you're interested in experimenting with a potential future direction for key security, then it's definitely worth playing with.