Pretty much all Arcam remotes work with all Arcam gear, or so my 30 odd years of buying their stuff suggests. I would look on ebay for any Arcam remote that has the right buttons and not worry about the model number.
EDIT: I just googled it and it seems the CR60 has unusual buttons due to it being for a multi disc player. So it may not be as easy as I first suggested if you want to be able to switch discs by remote.
The Alpha MCD does appear to be in the Logitech Harmony device list though so if you can find a cheap, second hand, basic Harmony remote you might be able to use that.