My experience:
I had 980 days out. I got a letter to go in to pick up my card. They questioned why I had so many days out, but were satisfied with my answer (we didn't move right away after we landed).
If you are from a visa-exempt country, I think that waiting to renew would work well, especially if you can enter by land. I crossed the border (by land, in my own car) at least 50 times after my pr card expired and I had applied for a new one. It was never a problem--sometimes they just scanned my pr card; sometimes they preferred my Nexus card. My pr card would up "expired" for them, and I would just explain that I was waiting for my new one. I think if you explained your situation, you wouldn't have a problem--you could try calling the border you would be crossing (if you can do it by land) to see what they say (smaller crossings seem more willing to be flexible, in my experience).
Also, I saw an earlier post of yours asking about whether to report day trips out of the country. I did not (and I had many, many of them).