I agree (obviously) with p919h_lm, seems odd to me that GPS units and FMC units can be hot swapped out like they can be in the 146, F28, etc. but the fuel flow/quantity gauges can't be made the same way?
As a fallback, just creating textures where the needle behaves the same way etc but the markings are adjusted to correspond with pounds, and letting us download that and install it ourselves overwriting the metric version would be acceptable.