Thanks for the advice Jeff,
I had a quick look a sybmigrate, and although I can't find anything that definitively says that sybmigrate supports conversion 11.9.2 it's a pretty good option, and potentially less risky that migrating to SQL Server. I'm going from windows env. to windows env. too which helps.
At least I now have a plan a and a plan b, so thanks all for your advice. I'll report back with what eventually worked .....