If you're going to spend $89 for a bike computer, why not spend a tiny bit more and get one with GPS and Ant+? You should be able to find an older Cateye Stealth 50 for that price, along with a cheap Ant+ HRM strap; maybe add speed/cadence sensor down the road if you want. Lezyne and Sigma Rox also have similar bare bones GPS units these days too. My 2c.

PS I have a Stealth 50 going on 2 yrs and has been very reliable.