I don't think it'll work but no harm in asking or trying to be sure. If he machines the back then the spacers lip will stop the spacer sitting flush with the hub for sure and if he machines the front then I think the spacers lip will fall off.
All this time I thought my YTS in mechanical engineering was waste of time 'cause I preferred coding BASIC on my Spectrum 48k then I come across this dilemma and it all comes flooding back.