I wouldn't worry too much about squirrels chewing straps. There's a bumper crop of squirrels on the public spot I hunt and there are old stands that have been in there so long the straps are choking the trees to death, squirrels haven't touched them. I've taken a few of them down and when cutting the straps they pop as loud as a .22lr because the tree grew into the strap for so long. I'd bet 5-10 years for some of the stands. Would I hunt from them, hell no, but the squirrels didn't do anything to them.
Not to hijack, but I'm actually going to perform a public service in my spot and go in there after the 2 week deadline to get their SH** out of there and I'm pulling every single stand that I can. There's hang ons, climbers, and ladder stands the trees have grown into they've been there so long and it's just killing the trees. If they are there after the deadline with no name and info on them, as required by the regs, as far as I'm concerned, it's trash and I'm pulling them out of there. Probably will take them all to the dump.