Dunno if you ever found your blue singer 15 clone... But if not maybe its time to find one?
I've been so busy planning my wedding and jumping through all the proverbial hoops that I haven't even had time to finish my last machine! (I've also been completely absent from this forum!!) but a new machine is coming my way (it's a mystery singer. Haven't seen it yet) so I'm hoping it rekindles my want to play with them!