Ouch. I think we managed to arrange a partially working configuration that allowed a workstation to access a VSM 6.X environment as well as a VSM 7.X environment for a grace period after migration.
I have an idea, but it's a stretch. Do you use/require the 64bit web client, or only the 32bit? The rationale here being that they are, in fact, separate Active-X controls. You *might* be able to have differing versions of the client installed if one was 32bit, and the other 64bit. You could access one of the versions using the 32bit client (limited to 4 video panes), and access the other VSM version using strictly the 64bit pane.
Of course, this is providing your OS/Workstation and browser version / configuration would allow such a kludge. :-S
Bulletproof Solutions Inc.