It's a good luck. I really don't know. Anything is possible if you want to chuck money at it, but I do doubt it could be done succesfully.
The other thing is who would do it-I suspect the Audi dealer wouldn't, and would you want to trust an aftermarket fitter who may have neve seen an A2, let alone been let loose on one.
By the time you pay for it, may be cheaper to chop and change to an open sky A2....
Steve - 2002 1.4SE petrol, Silver, black/black interior, Then an identical replacement 2003 A2. Now a Toyota Corolla 1.6 T-Spirit