Michael,
I've encountered the same challenge and the only solution I've found is to run the vote in non-anonymous mode, set the Vice President vote as Ranked-choice, then execute the analysis manually eliminating the President candidate as the first step.
I do agree it would be nice if there was a way to tie these two contests together. But, I suspect there might be some big assumptions such as the Candidate names between the two would need to match identically. Maybe someone has found another, more creative way of doing this.
-Jeff
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Jeff Scheel (he/him/his)
Director of Technical Programs, RISC-V International