Oh yeah. I’m currently using Supabase as a bridge, so an npub can just click that button and be done immediately. Next time I go to the Subscribers page, I’ll be prompted to add any pending subscribers to the kind 30000 list.
Case in point, I just went there and saw nostr:npub1n3rmk5g03eej40rg2x83azxnml879lxxynxegfawl36e6qqrs8gqllmkh7 subscribed. I clicked OK, he was added with a pending state, and then I saved the change to my list.

