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I don't think that will work, but my vacuum toilet may work differently from a Vacuflush.
I run all the waste from the toilet into the holding tank.
There's a a Y-valve at the holding tank outlet:
One side goes to the deck pump-out;
The other side goes to a manual diaphragm pump (Whale Mk V),
which goes to the "direct-overboard" thru-hull.
It's worked well for many years.
There are diagrams of this setup in the West Marine catalog, I think.