Injectable mini NFC chip (think cat/dog “chipping”) CMBs.
Basically a way to introduce the mechanics to the player early, without being exploitative or overpowered.
Instillation would require a “NFC chip injector”. The injector would need to be prepped with a disinfected cotton ball/rag (or one required nearby) so as to avoid the risk of infection. Possibly the use without one at the risk of infection (getting out of the lab would be a bit more complex if using one of these 
).
This would of cause hurt, but be possible for a player with some first aid training to apply (it’s an injector, would need to be placed in the correct spot).
Things like an LED light up watch just below the skin on the underside of a wrist, or a bit of flesh on the arm. An LED palm torch, or a small firelighter in the palm. Things like the firelighter would use more bionic power, but the player should be able to get 1 or 2 uses out of them).
Basically, and CMB that does not require full surgery, is close to the skin, a single small chip like structure, and does not require user programming (something like the repair nanobots could require setting to a users DNA/body chemistry in a surgery robot, thus balancing in both lore and gameplay the skill limit of such installs).
A way to flesh out the “commercial” side of CMBs.
These would be pill sized NFC/chemical to electricity/capacitor chips.
Possibly all powered via nfc. The player could carry an nfc “powerbank” to power them externally, they could be powered by external equipment (card readers/terminals/riot bots), or using internal wireless power transfers.
So as an example, a few would be:
NFC palm identity chip: Basically passively powered. Pass your palm over any NFC chip/credit card/terminal/bot for access checks or currency transfers. Warning, only works in areas you have been granted access!
Electrolyte Catalyst Chip: A simple power supply that feeds off the salts in your body using a catalyst and converts them into electric power. This power is sent via near field transmission wirelessly, so avoids the need for surgery. It has a very low power output though, and will usually only power a watch continually, or an LED torch for a few minutes.
Power Storage Capacitor Chip: A small pill sized capacitor placed under the skin. Only enough power stored to power the smallest CMBs (probably like 10 or 20 units in game?). A necessity for palm lighters or LED torches.
An LED torch and a simple palm fire lighter would also be possibilities.
IMO late game, the player has 100s of lighters, or crafting for fire drills that this kind of CMB would take out some clutter gameplay wise, and would not be out of place lore wise. They would add something where some quality of life, lore flavour, and simple exploration mechanics can exist, without being the CMBs “one shot plasma rifle arm” type mechanics.
“Just plain better” than an LED torch/fire lighter/watch would only come into play, if we ignore those items would have a lot more fuel/battery availability than a tiny NFC/chip based system. So hopefully the NFC chips would not negate out any other items in the game.
I’d be interested in adding them myself as .json edits later, and did have a go a few months with it… but I don’t program, so have been waiting for some of the mechanics to settle, before I go back at looking at how to do it (I would not know how to make them dependent on an “injector” device, instead of on the surgery robot).
