I like the current female companions, actually both of them and Wyll are the only companions I'm sold on really. But yes the game completely needs more female characters of different and varied kinds, not just, 'nice' or for player consumption
Shadowheart was my favourite companion, I say was because I hear rumours she's been changed and haven't gotten far through the replay. But I assume not that much. And wassname, Githlady, is the driven paladin type that usually works in BG, just with more interesting beliefs.
Modder-created companions are not going to be fully integrated into the game in terms of their story and their reactions and dialogue lines within the game. And in that case I may as well create the companions myself (which again to repeat, I do not care for at all).
Has Larian said something about this? Modders in BG2 did a good job of fully integrating companions into the game, often more so than the base game did. It would be a shame if there were limits in place to stop that being possible this time around despite just the difficulties brought by voice acted lines.