One thing you might try is txmanifest (see txmanifest cookbook and txmanifest-wallet). Basically, you would write a certain JSON file that describes the details of how to interact with the contract, and then an ever-growing list of Simplicity-compatible wallets would, if their users trusted and imported that JSON file, become able to interact on-chain with instances of the contract.
This is being developed by @stringhandler, and getting Styx to work with it could also expose missing features or rough edges in txmanifest itself. It would be a benefit to our ecosystem to have that kind of feedback.
It doesn’t necessarily address the whole UI or discoverability question, but it might be a great step toward wallet compatibility. (The txmanifest-wallet project is not meant to be the only compatible wallet, but rather a reference implementation for experimentation purposes.)