If you do get two and bino them? some things to consider:
the APM 1.25" adapters should have the least in-focus about 20 mm,
The starlight adapter, maybe 33-34 mm.
I like the Starlight adapter because it is removable without tools ( and I like to store the ASPH in its case which will not fit the adapter too).
So it depends on how much infocus your scope has?
Well, when BV'ing, a short(er) light path is always desirable. My current Leica has the APM adapter, so I'll have to try it once I get a second unit, in that format.
I'm fortunate to have more than one scope to choose from, and at least two of them (the CAT's) shouldn't be an issue.
Now to scare up a second Leica!