It's not that big if a deal...MWS IP is > than OSA IP, however it's not the end all be all. When I left the C-21 in 2006, they just started the ACIQ flow for MWS guys coming over. If that's still the case, you'll quickly upgrade to IP. I'd bet it would be around the 1 year point.
The C-21 was a great time...simple jet, simple mission, & good flying.