How to keep getting borged from ending your traitor round

[Arborinus]

Nanomachines can be dealt with by not eating cake. Or by opening an APC and shocking the shit out of you. Artifacts can be dealt with by not touching them. Being borged can be avoided by not dying.

If this were implemented then we'd need another sure-fire method of bringing back a traitor as a nontraitor.

There's no quicker way to gain a chef's trust than by eating a slice of his cake.
I would see this item as something you spend telecrystals on for that extra insurance. If you want to take the risk you can.
Make the implant a big chip wedged into the brain, something an ignorant roboticist might overlook but still detectable.