Peeled crawdad tail works every bit as well as popcorn shrimp and can be treated ahead of time the same way. A lot of times when you can get crawdads you can get a lot of em, just batch em up peeled and salted and freeze them in outing sized plastic bags. If you haven't tried using one of those vacuum freezer bag sealers, you owe it to yourself to try, but a hint firm freeze your fish and bait pieces flat first like on a cookie sheet or you will be sucking juice right into the machine, which will be a mess you can avoid.