Very soon, Thorchain will enable LUNA and UST, then it will be much easier. Basically, to get funds in to Osmosis, look for any way you can get LUNA, UST, ATOM or CRO, and then shift them to a native wallet (Keplr is easiest).

Soon, Thorchain, and there will also be a bunch of bridges between ETH and the Cosmos (but gas is ridiculous). Osmosis will implement a bridge to Ethereum (likely using gravity bridge) Sifchain already has a bridge between Eth.

Hope that helps.