I think the first question here is to the DM. Why?So, the question: would you play in such a campaign?
The change is a pretty major constraint on playing the class/race/archetype that I would like so before committing myself, I would want to know why the DM thinks this would improve the gaming experience.
Already, “trust me, I have a plan” is a non-starter. Why does the plan depend on you not sharing the plan with me?
“To try something different” is also a response to be wary of. I am always wary when “try something different” means “different is a large impact on you, minimal impact on me”.
If there is a good reason for it, I’d be willing to try it for a short campaign.