Looks like @blockstream added stealth address support to liquid but I haven't been able to find any public discussion on it anywhere?
Here is the paper on a previously proposed bitcoin implementation of stealth addresses from @peterktodd:
Discussion
Combined with confidential transactions it may be the easiest way to privately accept bitcoin donations. Just post a pgp signed liquid stealth address.
Main hurdle is private conversion between btc and lbtc. Current options seem very limited: custodial risk & timing analysis.