But it's very rare for us to use lbs as a measurement of weight (at least directly)

No you use "stones" for peoples weight. Which I consider to be the least useful unit of measurement in common use today.

I live in the UK and I use the metric system for pretty much everything, including weighing humans.

Everything except driving speed, for obvious reasons.

And if you did for some reason, you'd almost certainly write it as lbs rather than pounds to avoid this entire thing.