He is on the right track though, using the felt with diamond is probably the best medium with it..
If I was going to try what you have in mind I think I would have to go with what has already been said, the .50 Diamond to start and then the .50 CrOx to smooth it out, the experiment I did with the Felt SRD strop and Diamond some years back was with .50 and .25 I was well over 70 shaves and could have kept going easily but honestly I got bored with the fact that it was all to easy

I was doing weekly stroping on the diamond which honestly the razor didn't really need, but I was trying to actually destroy the edge in this experiment it was a surprise that it didn't happen...
You might want to fire a PM or email to Lynn he knows those strops better then anyone and might have a good idea what you should use..