Absolutely, those are great ideas, we definitely need more apps tackling these problems.
Wallet fingerprinting is a big goal of chain analyze so having more privacy related standardization in wallets to protect against that would be super helpful.
I plan on trying to add a "Transaction Privacy Analyzer" to Live Wallet to help highlight the potential privacy issues in a bitcoin transaction, hopefully catching some of these errors before the transaction is broadcast. I noted about it recently here
https://primal.net/e/note1xe2vq6sz83htekmt07f3j039vg2g6lp7pn0z0sjn6u9w3lg0628qvkz2sr
i know how to build a wallet server, have worked a lot with btcd
building something that does much what i design is something i could definitely do and help facilitate an isolation between UI and coin control/wallet services so we divide our labor more efficiently