Balancer movement is not a problem, if you are pulling the timing cover it will have to come off anyway, I would suggest replacing that gasket too, it likely will leak if you don't.
While you have the balancer in hand I would replace it.
I use anti seize on the bolts for the cover and pump, coat the entire
Oh Yeah, all seals and gaskets will be replaced. Plan to use the copper antisieze. I’ve the zinc/silver freeze steel to aluminum under heat. Not a fan. Though it was on brakes someone had done to my nephews WRX, had to heilicoil them. Wishing I ordered the harmonic balancer when I bought everything. She isn’t to cracked but I will be ordering it ASAP.