As far as I know no one has combined the two so far, although there is no reason at all that they wouldn't work just fine together.
The distributor is just the trigger device (just like most of us already run) and CDI is a suggestion, not a mandatory for that distributor.
"Multi spark" does have a slight advantage over HEI, but my HEI kits also have advantages over "multi spark" units.
Two big advantages are that a person can get replacement parts (in stock anywhere) if ever needed unlike having to order and wait for replacements from MSD and the others, and the quality of MSD seems to be dropping off because of the Chinese made units.
I can tell you that out of all the HEI kits I have sold there has not been ONE unit fail for any reason. (not that I have been notified of anyway) and you would think I would have heard about it if there were any that failed.