A little hint for BT:
for my reconnect hack I initially searched for the jolla BT settings qml on device, copied it and just removed everything that didn't seem useful for my purpose. That was a good starting point to understand how it works. You could do the same or unpack my rpm and have a look there (it's all qml, but I think I removed the "bt on/off" switch).
Fair warning:
I don't call it a hack lightly, it's a bit rubbish. Also, I haven't had a look at it since I got a newer jolla without BT problems.