I would steer clear of reproductions, the ones I have come across are complete rubbish, but you never know, you might be luckier than me.
Go to my Youtube channel (see below - sorry, since the board changes the link no longer works) and watch my video "How to Remove a Motor from a Vintage Machine". There you will see I show a genuine Singer handle and compare it with a reproduction. If you are interested in seeing that machine, I did a thread on it here called "Look at this Bobbin Winder." I have used the machine quite a lot recently - it sews beautifully.
The market here in England is completely different. We are knee deep in hand machines and the easiest thing to do is get hold of a below average machine and massacre it for parts.
Tallbald - please let me know when you finally do a conversion - I'd love to see the results.