Under a drysuit

I'm curious if anyone dives with a F5 under a drysuit? I'm still interested in the heart rate data, but I much prefer to use my dedicated dive computer (rather than a descent) due to screen size and a few other features.

Naturally (sigh) the 100m water rating isn't 100m water rating (this is a long-standing farce), but inside a drysuit it would be shielded from the water side of the pressure influence, and it just be air pressure - if seals were breached it would be air only, and they're not likely to see spikes in pressure.

Just mulling over the risks vs knowing my heart rate.