I think this is the product you’re referring to:
The downside is that the connector I’m using does not supply a power rail, so there’s nothing to power the chip. The box is completely passive, and deliberately so because it’s a generic interface: designed to work with equipment that assumes a passive external interface.
If something fails on my main rig, I have the hand-held radio as a back-up. This wiring harness is compatible with the same control panel, so my helmet (and any other headset I own, including the hard-hat people have probably seen me wear round the space) can plug into the DIN5 socket and the keypad on the handlebars plugs into the DIN6. The hand-held does expose a 3V3 rail, but with very limited current carrying capability.
I also have interfaces for my Yaesu FTM-350AR and the Garmin Rino 650, the latter of which just presents speaker and microphone connections (not even PTT). So if I need to do UHF CB, I can plug into the Garmin that’s on the bike, or if my FT-857D died completely, I could swap it out for the FTM-350AR.
Years ago, I had another interface for the Nokia 3310, which like the Garmin, does not expose a power rail. On the Garmin, I wire PTT in series with the microphone, for the Nokia I wired it in parallel so it functioned as an answer button (which with voice calling, worked a treat). A MCU or a chip like the AMS AS5013 would require a battery in such interface circuits. For this reason, anything “active” just isn’t going to work.
The reed switches are passive, readily available (Jaycar sell them), and also hermetically sealed, so are quite rugged. They’d be a drop-in replacement for the button arrangement I’m using here.