I agree the 6X model is more appealing from an astronomy standpoint because it is more unusual. I might order the 6X first as a steady and lightweight hand held astronomy tool. I know a lot of people are very comfortable hand-holding much higher power binoculars for astronomy, but I think I would enjoy a small steady 6X like that, just for evening walks and for a quick wider view when working at my larger telescopes.
It amazes me how quality porro prism binoculars have so completely vanished from existence. I'm very glad to see you planning these.
I will definitely wait for center focus versions if you promise to make them. Especially with those close focus numbers of 2.5m and 3.2m, center focus will make them so much more useful.
It's too bad the 6X version has 56° AFOV. I would like the 6X30 even more if it had a wider FOV.
But more important than the FOV is to use ED glass and a well-designed high quality field-flattening eyepiece.