a TL;DR would help here but I quickly scanned
the wGrin would be dull af ERC20 tokens and you’d have to burn or swap them for the real deal as part of some other (likely centralised) service. I don’t think many would convert and the tokens would be treated as trading instruments. this approach would obviate (obliviate!) the need for grin wallet integration into the DEX
as mentioned many projects operate this way, some before their mainnet releases, so there must exist a variety of methods for converting a wrapped coin token to the real coin
it might also be fun to create the swapping service as a tor hidden service