There is a guy in Australia who’s done a bunch of youtube videos with a do-it-yourself way to Bluetooth any GSMR radio into your helmet. There is a simpler way. Buy a baofeng radio on Amazon and also on Amazon there is a dongle (I think that’s what they call it; its Austrailian for a Thingamagiggy) that plugs into the mic plug on the radio and outputs and receives a bluetooth signal. It also works on Kenwood radios. By the way, it looks like it would plug into a midland, but it doesn’t. The dongle comes with a useless over the ear bt headset, like a cheap thing to use with a smart phone, but it will also pair with a Sena or Cardo. This thing also comes with a bt battery powered PTT. I just tried to look it up and couldn’t find it, but I’ve seen it on Amazon and youtube. Up to Seven years ago Motorola carried a GSMR radio with BT that would have worked but they dropped it.
What I did was buy a Midland GXT1000VP4 and also a headset. works with Full face helmets only. Also comes with a ptt button and velcro and I put it on the handbars near the clutch lever. The wires are cumbersome, but it works beautifully. Model AVP-h2. Oh yeah, for $170 a Sena SR 10 and the right cable will hook up to most any radio and Tx and Rx and comes with a BT remote PTT.
check out youtube videos by Keith Jobson (the dongle) and Ringway Manchester