Force apps onto PTR?

I want to install the Aero Tracker pro and heart rate monitor companion on my pebble time round, but the app store says it's not supported on my device, only the square pebbles. Surely there is a way to make it install, maybe it will just look wonky?

Otherwise all I'm trying to do is show my current heart rate on my watch, getting the measurements from my Polar H9. If there is a better app for this, I welcome suggestions. Thanks