^Evek is still alive post-DS9 in
A Stitch in Time, so
The Badlands evidently doesn't fit into the main novel continuity.
And yes,
Dark Passions is the only Susan Wright Trek work I know of with multiple bisexual female characters. Wright did pioneer the portrayal of LGBT relationships in Trek Lit with Jayme and Starsha in
The Best and the Brightest, though back then it had to be kept subtle and implicit; but I can't recall any instances in Wright's other Trek Lit. Although of course many other authors of various genders and orientations have included LGBT characters and couples in their work since then, which is just a natural part of representing human diversity as
Star Trek is supposed to do.