I would do a ebony stain.

I think they look great as is, but I understand wanting a change. Will you be leaving the exterior side the current stain?

Have you looked into doing a ceruse treatment? I think it would be the color you like, but look so much more natural and organic than paint. I’ve never done it myself, but there’s lots of info on the web, and maybe someone who has will chime in.

I used to paint furniture with chalk paint, and I personally wouldn’t use it on these doors. But that’s just personal preference, not a right or wrong thing. And since you’re experienced with it, I’m sure it’d be fine. Hopefully Beth H sees this — she’s a very experienced and knowledgeable decorative painter.

https://www.houzz.com/magazine/renovation-material-cerused-oak-stsetivw-vs~2366168

https://www.bobvila.com/articles/cerused-wood/

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Of course, if you don’t want to see wood grain, disregard my whole post! 😄