RBD coexistence with WDSC 7.0

I'm trying to get the trial versions of RBD 7.5.1.2 and RDI 7.5.0.2
working so I can show my management how much we need EGL ;-) However, I
also have a copy of WDSC 7.0.0.8 with interim fix 001 that I need to
keep around because it takes us more than two months to change a light
bulb, and I live in WDSC. RBD doesn't play nice with WDSC, even if it's
stored in a separate location. No idea why, but I did find some
documentation, which mentions my issue. Apparently it will be corrected
some day, but not any time soon.

I can back up the PC. No problem there. So I'm thinking I should back it
up, then uninstall WDSC, RBD and RDI, clean up any lingering file system
objects, then reinstall RBD and RDI. However, due to the amount of down
time that will cause, I can't do it during the day, and I'm reluctant to
invest the time if I'm already doomed. I've been down that path before
when WDSC 6 was released.

I'm hoping someone has blazed this trail already and can give me some
advice. Will an uninstall and reinstall of RBD and RDI work? Has anyone
conquered this issue? Does it matter which suite is installed first? Any
info gratefully appreciated.

Thanks