Then we should push Molly to look into LN, ecash or Monero support.
Besides that I don't think messengers and wallets should be combined. It's just another lazy convenient thing that breeds future problems.
Whi said Signal is private ??! Each time you buy a simcard they KYC , each time you download signal ask you for a telephone number for being able to use it... where is the privacy ? ....no sense
Molly has a bounty for replacing MobileCoin with Monero. They have worked on a Monero library.
https://github.com/mollyim/monero-wallet-sdk
For a messenger with wallet and sending to recipients I can only think of Keychat at the moment.