Dave we have access to relatively cheap aftermarket speed controllers here but they would only work on our single leg 110-120 volt power system. I don't know what you have available. The controllers also work with other universal type motors as long as they do not have their own speed control or soft start. Harry Sinclair from Oz might know as I think they are on the same power system. He goes by Harrysin here on the forum.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.