Spy mode things.

[APARTHEID]

Introduce the spy character in mixed with these spy-like objectives and a different set of traitor items steered towards espionage. Keep spy as a mode where there are multiple. Remove the implanters.

The implanter, as it is, destroys spy mode, as you're just rushing to implant the four best people available to gang up on and rush down everyone else that has the slightest chance of being a spy.

Spy as a stealthier traitor round? It's a cool idea, but it'd require all the traitor items in question be revalued and balanced to serve the purpose.

It's worth a shot!!