[PROBLEM] Generating lightmaps for linked objects!

Hi!

I was wondering if it’s possible to generate a common lightmap (I’m using texture atlas for that), or essentially modify the object data for many linked objects and maintain the link, or better yet, update the linked objects in their original .blend files?

I thought that making a proxy from a linked object would suffice, but that just creates a local copy of the object data, and I’d like the object data that I change in my level file (with the linked objects) to be transferred to the original file?