The issues isn't the risk of complication because I've replaced Cheek Implants done elsewhere for 20 years. The real issue is that the Cheek Implant is almost surely impinging on the infra-orbital nerve. Fixing the Cheek implant to the bone requires at least 2 screws (the implant can still spin with 1 point fixation) that can cause dimpling of the implant. The least invasive way to deal with the issue is to lift the tissues up over the front portion of the implant alone and trim that section of the Cheek Implant that's in contact with the nerve. This should alleviate the tingling/numbness and should leave the rest of the implant pocket intact so the implant won't move.
I have, over more than 20 years of placing Cheek Implants seen variations in the position of thios nerve...and in a handful of patients the nerve exits to low and lateral for cheek implants to be used. It might be best to go through an incision in the lower eyelid to access this section of the Cheek Implant thus avoiding lifting the cheek tissues completely.
My only concern, if a significant portion, of the Cheek Implant needs to be trimmed, is that the cheek shape will change and be different from the opposite cheek.