Yes, f/f is a harder sell than m/m, but the heroines all categorically refuse to be made into guys, so f/f would be the only option to re-release them as queer romance. And yes, the point of making them queer romance is that they would be of more interest to Aster Glenn Gray readers that way... although, as you say, of comparatively limited interest.

It would also be a good in-between project so that when I'm stuck on writing something new, I can still be working on something.

If I go through with the project, I'll also need to come up with some new coffee-themed titles!