9mm->.45 need a lot of work, you will need a complete top end, ejector, mags etc. Cost too much money and not worth your time.(short answer not possible without throw a lot of money in)
.40s&w/.357sig->9mm I have seen a few gun can do it, (not 9mm->.40s&w)
22lr<-9mm I have seen this kind of kit too.
If you really want a .45 you better off just buy one. those kits are very hard to come by in Canada, you may end up wait a full year.And yes, Equipment Exchange, go to Exchange of Pistols and Revolvers section.