IWB
You are so lucky your wife is on board. Hopefully (for this exercise) no kids?
If you want to go with a bang then fine. If you are determined to leave but want to open eyes then take it more slowly at first.
But if you want to fade then drop the eldership first. Maybe in August so that a new CO who doesn't know you as a cobe will have arrived in September and the old CO will be tied up with leaving the circuit and not interested. You and I know that being cobe is no more of a higher position than any other elder but sadly many in the hall think differently and you will be in the spotlight more than any other elder.
Claim "stress" and "health issues" and drop the eldership straight away but stay as reg. pios. This shows humility of a rare kind. Then in three months drop the pioneering.
Then three months after that move congregations (not necessarily move home though) so your records move. Fade from the new hall over a six month period.