IMO every wallet should expose invoices, but even if they don’t, I built a solution for that a long time ago https://notazap.vercel.app. I also just made lnurlzap which allows anyone to zap any nostr event. Zaps are anonymous if you use lnurlzap lightning addresses though. 

 I don’t want to have to send noobs to a  website just to zap. 

 Then don’t. I’m just saying it’s possible.