I created a simple Lightning address version of a Bolt12 offer. I encoded the request details into the local part of the lightning address, detect and parse when I receive the request. This is a request for 21 sats. I can do any currency as well.

The request looks like this:

trbouma+21+SAT(at)safebox.dev

So far it works with Blink, WalletofSatoshi. Phoenix chokes on the address.