What are the stats on mint with warps conversion vs. farcaster-transaction (to cb wallet) conversation? 

I'd think mint with warps is much better, but I recently ran low on warps and have just been skipping mints rather than topping up :D

One challenge with frames is that if the action is a mint, you have to choose whether to show "Mint with Warps" or "Mint with Wallet".

Warpcast could solve this by expanding the "Mint with Warps" UI to let users change the "Payment Method" to ETH on any chain, similar to the best-in-class UX you see on Zora

Warpcast knows the users' connected wallet, so could pre-populate the payment methods to chains where they hold enough ETH.

The calldata to mint could then be transformed into a cross-chain mint using relay.link (same Zora uses), and handed off to CB Wallet for execution on the right chain