I had to think about this before answering. I have to agree the previous commenters - the only way to pull this off is to do so by being and example. You cannot do this as an elder.
If you are not in a position to leave the organization at this time it is understandable. However, for your own well being I would recommend pulling back as far as you can. For example:
- Step down as an elder.
- Stop giving any talks.
- Stop commenting at the meetings.
- Report the minimum amount of time possible.
- Live your life as you want without getting disfellowshipped or reproved.
- Be happy.
- Be happy.
- Be happy.
When you are doing only the absolute bare minimum the organization requires while simultaneously demonstrating your happiness those in the congregation will begin to question what is going on. People will notice your happiness and they too will want to experience what you have.
This is where it will get tricky. People will approach you and ask you why you are happy. You cannot bring up anything in regards to what you have stopped doing for the organization. You cannot bring up any thoughts or beliefs on the religion or the organization. Say nothing that can be used against you.
I would consider saying something like - "I am happy because I am content with serving Jehovah and being part of his organization. I really cannot put into words why I am so happy. I guess it can only be experienced and not explained." Then give a big, genuine smile. People will not be listening to what you say at this point. They will only be seeing how happy you are.
This is where those in your congregation will fall into one of two categories - There will be those who judge you as spiritually weak and break ties with you. There will be those who see your happiness, connect the dots, and become PIMO like you or may even go full POMO.
There is a brother I know growing up. He was an elder. I was friends with his sons, all of whom became Ministerial Servants. One day this elder had enough of being "used". Because he was friendly and kind he was constantly being called up all hours of the day and night by members of the congregation who felt the need to confess or ask for help.
This elder stepped down and was pretty much done. His sons did the same. These days they will attend most meetings, assemblies, and conventions, but that is it. They all spend their time being involved in what they want to do. They aren't doing anything that would be grounds for disfellowshipping. If you asked them "Is this the Truth?" they would all look you in the eye and answer "yes," but they sure don't live like Armageddon could be tomorrow.