What's your concern with using the current boat
A cat is a great option. If you like the boat and really don't want to deal with it on the trip, take it off and store it somewhere.
The shallow draft
is a huge bonus and with twin engines, you should be good. Only thing to check would be range but you don't need anything extreme. I forget if it was 150 or 250 mile range under power to get from St. Louis to Kentucky Lake.