Papers from thesis - short term postdoc?
While I'm not in Physics, my experience and knowledge (Comp Sci) would suggest that:


Finding such a grant would generally be difficult.
Your best bet would have been some kind of late-PhD-research-assistant/short-term-PostDoc employment with your PhD advisor or at your lab; if that's still an option, try it;
Maybe it's possible to get a part-time short-term teaching/teaching assistance position instead of a proper research grant; it "eats away" some of your paper-writing time, but it might be better than no job at all