I have the same situation so I hope someone answers your post that has the solution. I was contemplating using banjo strings but most banjos have a much longer scale. I might try it anyway.
Alright!! I didn't know someone actually made metal uke strings. Thanks!
Well Dani and Bear, here's the way I approach this sort of problem The notes on a concert uke are gCEa from 4th string to first. Now consider the short 15' scale and what electric guitar strings would be tuneable up to those pitches? I've never actually done this so here's a guess coming from other experiences. I'd start with a light electric set which has a .009 for the e string I believe that would tune up to A440 on 15" scale with no problem for the 1st string. The 2nd string in the set is likely a .011 and could tune to the E note of the uke's 2nd string. The 3rd string of the set could be brought up to the uke's C. Now it gets a bit tricky for the 4th string because most ukes have a higher note for the 4th than for the third but it doesn't have to be. Many players prefer low G tuning and you could use the 4th string from the electric set for that. If you want the more traditional high G you'll need another .009 or .010 to achieve that. Here's a set that should work
I believe that will work too!