I think it would be fun to get some of the T shirts and wear them while playing ukes on videos and at some events. If the T shirst cost too much, just make use a marker pen to draw a similar motif on a blank T shirt. Obviously it would not be ironic, and if you do make such a video you should deny that it is ironic on the video, use the words "this is not ironic and I am not always unique". Also you could deny you are playing a uke and call it something else, like you are in denial. Maybe even talk about the new and hip SNUPH genre of not-ukulele music while you destroy a heavy metal song on your four stringed instrument that is nothing like a ukulele, except that it is made of koa and has a figure 8 shape and uses ukulele strings. You could say it is just like a ukulele only betterer. I suppose if there were enough videos there could be a competition.