That's enlightening! Then, I guess recovering the two missing words should work absolutely fine as long as the original owner did use the wallet for Bitcoin at least once.
Yeah, that's the kicker. If the default bitcoin wallet at m/44'/0'/0' was never used, then the search will return no results. OP would have to try other derivation paths, and then potentially other coins. btcrecover does also recover seed phrases using major alts such as Ethereum and Litecoin, but OP would need an address database for each one and would have to exhaust the entire search space multiple times over.
After recovering them, the seed could then just be imported into a trusted (!!) multi-coin wallet to get access to other crypto.
The only wallet I would use for such a task would be a hardware wallet. I'm not aware of any multi-coin software wallet which is open source and reputable.