I doubt you’ll get interoperability with your Garmin units but I guess it depends what you want to do. The only thing that may allow this may be something like the FR620.
I bought the FR220 recently and was woefully disappointed in the lack of interoperability between it and other devices. It still needs a cable to connect with my computer, and although its got Bluetooth 4.0 enabled it will only work with an iPhone, not with a dongle on my computer. Garmin Tech support are a bit pants.
However what I do get is a very nice, almost watch like unit for recording my runs. I wouldn’t get overly concerned about the HRM unless you currently analyse it from your rides.
If you want to use it for Nav look at Suunto, generally they do everything better than Garmin but are quite big (Ambit 2).
If all you want is something to track your runs go for the 110 unless you want to set up workouts, analyse HR and so on.
Soleus do a lot of cheap n cheerful ones but they’re quite bulky.