A "work around" I have found for alternate reference tone play back (yes I like A432) but it involves a 2nd computer. I send the mix out spdif to another computer with a reaper channel with "reapitch" plugin. Set it to -32 cents and "voila" all tracks pitched down 8 cycles to 432 (or whatever reference you like).

This should work using "rearoute" with in one system but I haven't been able to get that to work ..yet!