We've been working on that (ERA fasteners for buttons) as it comes. Not on a hunt - anything we touch we convert. If there is more in that area, we may get it. If it is pulling from building - no. It's like scrubbing aluminum, you can spend a lot of time doing it. Overtime we will get it.
I don't use serts on everything. I have been working on ducting the radiator and there I tap the sheet and screw it together with 10- 32(?) button heads. There is a fair amount of fastener conversion involved with the Cooling and adjacent panels.
chr