I agree with everything Brad says above, just to add...
One thing you need to consider is that thinner strings will have less tension, but less tension after a point usually leads towards intonation issues (being quite sharp), however on an instrument such as the RISA LP, with adjustable saddles like and electric guitar you have maybe 10mm of travel to adjust the saddles which is a lot more than on an acoustic uke, which on an acoustic uke, the saddle and space to adjust the breakpoint of the string is typically 3mm or less.
Just realize that you are probably going to need to adjust the saddles for fixing intonation (for which all you need is your tuner and a small-head phillips screwdriver) each time you change to a different gauge of strings.
This is all par for the course and standard procedure for electric guitars and basses, and also carries over to steel-string electric ukes.