I don't think you can roll back to regular ETH once you stake it. You'd have to sell and then rebuy unless I'm mistaken. IDK if they'll do a hard fork, but that might kill on taxes.
The thing I didn't consider until after conversion was tax implications. IDK if the conversion will be considered tax able. my preliminary research says no it won't be, but who knows what the IRS will say. The other thing to consider is if you can't sell, but get the 6%, you'll have to be able to pay the tax on gains for it out of pocket with no assist. Coinbase says it won't pay out until you can sell iirc so that might not be an issue.