I've seen this floating around too, and was curious.
I had also seen via the Service Manual about a year ago that it was possible from a technical standpoint to do UHF1/UHF2 as a legitmate configuration on a 7000, but I figured that was just an "on paper" thing (meaning : Who the heck would actually need this band-split).
I'm trying to think of a use-case for this bandsplit (practical, not hobbyist).
I know in Pennsylvania there's a system in Dauphin County that has a Phase 1 system on the T-Band... maybe it would be some EOC radio that could run on that system, then also have some kind of "interop" with a DoD system (Conventional or TRS).
Oh well, I suppose it doesn't really matter at this point. Anybody that needs this going forward would probably just get an APX 8000 and have their choice of all the major bands!
Or heck, if all you need is Conventional Analog, save yourself a crap-ton of $$$ and just get a Gen 2 TRBO radio (403-512).