I think one of the issues is that you still seem to think in terms of playing roles, so 'playing normal' or 'playing (or being) kink'. But most people don't want to have a relationship with a role, but with a person- which might include contradictory or multiple elements, but has a core of certainty about it. Perhaps having a relationship with this man might sort this out.
If I were dating, I would want this mentioned very early on as for me, I wouldn't want to be with a dom man at all and my only thoughts would be for the door. However, this might not be the case with everyone (and you are not a man!) and if you phrase it as - this is what I've liked in the past but is not necessarily me now, they may be more willing to be open-minded.
I would also be very honest, but I hate lying in relationships so whilst I wouldn't expect you to mention it on date one, I wouldn't want to go into a longer-term sexual relationship with someone who hadn't mentioned pretty fundamental preferences.
Different relationships do bring out different sides of you though, I have a good friend who was in a lesbian relationship for many years, now she is married to a man, doesn't mean she wasn't a lesbian for a decade, but rather that she is responding to the relationship and person before her.
Only you know how embedded this lifestyle is in your persona and how much you could leave it behind if the other person wasn't into it. I wouldn't lie about it though, lying is very destructive. Good luck with it all!