Sandal, my friend got the gender switch bug that happens if you start CC up and get a male character option first and don't flip between options and used it to romance Blackwall with a dude, dono if that got fixed in the most recent patch tho, I can look at those notes later to see. (Also I don't know how often it happens, could be frustrating to have to restart over and over to trigger it lmao)
But I love the transwoman idea!! I saw someone who is romancing Solas with a non binary character and I loved reading their unique perspective on it (alas did not save the link)
I heard about that, but I thought that the bug just caused NPC's to regard male characters as female and that it didn't affect companions.
Anyways, although I am not trans myself, as a member of the LGBT community (gay guy) the idea of a trans character romancing Blackwall resonates with me more than playing through a cis hetero romance with him. It may seem odd, but it's just how I feel.
Mechanically, since the game requires that my character be female in order to romance him, I will choose a female Inquisitor. I'm not sure about race yet, most likely human or dwarf, though.
And since the game will consider the character a female, it works, since this character will identify as female and will be glad that others address her as such.
However, I will RP her as being born male, and doing everything that she can and working with what is available to her to be the person on the outside that she is on the inside, since she obviously doesn't have the option of surgery within the DA setting. This is where I feel the CC is great in that it really provides options such as stubble for dwarf women and an adam's apple slider and makeup for all races and sexes. I applaud BioWare for that.
Maevaris will be my inspiration.
And Blackwall looking her in the eye and calling her "my lady" will make her smile every time. Gah, it will be great.