As in I think most women who partner with a trans man probably don’t think of themselves as straight and are less likely to be less adverse to adopting another label for their sexual orientation like pansexual, bisexual or queer.

Agreed. I would add the following potential reasons for why we might not see more articles like this:

• "Evil straight man" syndrome - Straight men have been identified in left-wing politics as "the problem" or "evil" more generally, compared to straight women. Many liberals I know (I am liberal myself, for the record) tend to assume that straight women are all on board with supporting minority groups. Straight women's homophobia may get a pass since everyone is focusing on straight men so much.

• Straight women more likely to be talked into gender identity ideology - You named this one yourself. I think straight men are less likely to buy into belief in gender identity, period-- and this is likely influenced by the pressure to seem "masculine," and same-sex-- NOT same-gender!-- action is seen as a threat to masculinity. Sex really does make a difference in how people act. On the other hand, women are often more pressured to be "harmonious" and may be more likely to succumb to pressure to change how they self-describe/self-identify. edit: Would probably summarize this as, "Same-sex relationships are a threat to traditional "masculinity," whereas submitting to gender identity ideology furthers the traditional "femininity" goal of being harmonious."

• Straight men more likely to defend their boundaries, thus inciting debate - Straight women are probably less likely to speak up when they're being coerced into an activity they're uncomfortable with, relative to straight men (because of: fears of retaliation/aggression; socialization, "you have to be harmonious!" type of messages that women are pushed into vs. men's being "be manly and fight for yourself"; etc.) So then when a straight man DOES push back on boundary-breaking bullshit, he's also more likely to continue arguing and not stop. Because straight men more often push back, you see more articles about MtFs and straight men than about FtMs and straight women.

• Society cares a lot more about dicks than pussy - "Take the dick, bigot!" somehow has a better (more popular?) ring to it than "Take the pussy, bigot!"

• Male aggression patterns, among TRAs - Controversial stuff, but a lot of research suggests that there are sex-based differences in aggression among men (male people) and women (female people). So it is unsurprising that we might see more MtFs than FtMs trying to pressure straight people to have sex with them.

Just my speculations, feel free to poke holes in them.

edit: Also I don't know of any such couples, lol. I've certainly never met one. Or even read about any.