As others said there is no easy way that they won't realize. No matter what you do, it will be discussed with the co, written to the branch etc.
But know for sure. The whole ms or publisher thing is not compulsory. It is your free time and labor you spend as a ms or as a publisher. You could just tell them "enough", stepping back without even giving a reason. They would many times ask you why / the co would ask you why. They would maybe assume that you have a hidden sin. But you don't owe them an explanation. It is all voluntary.
I was in a similar situation as you are. I never wanted to be a ms or elder, but I couldn't say no, so finally became an elder.
After 2 years being an elder I came to a point where my conscience couldn't bear it longer. I called the cobe and said I am resigning. I wrote him a letter and stated I had too many doubts about the bible being inspired of god, genocide and infanticide committed in gods name, don't agree with shunning of df / da ones. After a talk with the co I was free. Such a wonderful thing. The first step. I was a normal publisher. Brothers wondered what happened but i didn't care about the gossip. The elders said they respect my decision and it is better to step back than to fake it. They wanted to help me with my doubts. But they didn't have time to meet with me the next 2 years. I learned more ttatt and my doubts became certainties. My uberdub wife separated and the elders were back in my life. I had hours and hours of discussions; and I was clear to them that I don't agree with most of the doctrines especially the blood thing. I was surprised they let me fade. I went to less and less meetings and completely faded.
In the end when not attending anymore, most of my jw friends don't contact me anymore. So I am starting new friendships which takes time and is not easy.
Bit i can tell you. It's worth all the hardships and also sad things to be free. I feel great being able to live according to my conscience.
I wish you all the best in you personal path to your freedom.