Pitching an open relationship to normies

TLDR: a boring dude looking for suggestions for how to pitch an open relationship to people like himself.

I want to build a lifelong committed relationship with a female partner, but the ideas of sexual/romantic exclusivity and "cheating" don't really resonate with me in any way. This is not an identity marker for me: I don't even really like dating or pursuing women for sex. I don't want to join any kind of community or subculture based on dating preferences or sexual identities. I'm not looking for young people experimenting with non-monogamy or people dealing with commitment issues.

If there are stable and mature adults out there who share my thinking - I want to find them. If there aren't - I'm looking for ways to make such an adult to at least consider my way of thinking seriously.

Keeping that in mind: how should I approach pitching that, specifically on dating apps? My strong preference is to always be straightforward and I do that now. But maybe this isn't the most productive approach? I have a feeling that a stated preference for an open relationship in the profile looks... inevitably sleazy, kind of. And I see that it attracts the people I'm not really looking for.

Omitting my preference and springing it on a person during the date, on the other hand, feels very misleading and "game"-like (which I strongly dislike), even if can make make a good impression first and explain how I think and feel in detail.

I would appreciate any comments or suggestions. If you feel the same as me or have experience with people like me - I would especially appreciate your insight.