Man, I was having similar ideas like you too ;w;
I understand where you're coming from with how otome games are written though. But what games have you played? If you're like me, you've played the freeware ones and a few commercial ones, and the freeware tend to be written by middle/high school girls-ish age. And the audience for such games tend to also be middle/high school girls. If you've grown up believing in the idea of romance, you're not going to subvert the idea unless you've watched/read/experienced something that screwed your idea of love. And when you play an otome game, you expect to have good times with some boys, to choose one in the end and live happily ever after. When you screw with that idea...well, think of the reaction to episode 3 of Madoka.
The horrible thing is, though, many girls will be utterly pissed off that they can get their mans. And will be turned off to the game. |D Especially if there's no indication to that twist. Like with Madoka people were searching for the subversion because they heard of who was writing the script, so it worked out. For Evangelion and its wacked out ending however, there was ton of hate mail (but then again it's still generating money so whatever)
However if you'd like a personal opinion, I'd love to be trolled man. Well, as long as I have hints that I will be trolled, and that being trolled is one of its selling points. It doesn't have to be explicit, but perhaps if we had interesting screenshots then it'd be great!
Also: I was thinking of non-romantic paths of a way of being trolled/not-trolled at the same time. For example, one of the people whose paths you follow in one of my upcoming VNs is the MC's first cousin. Now I've heard it's legal to get married to your first cousin in Japan (and California apparently o-o;) but I think for a lot of people in the English-speaking world it's a bit squicky, so I've been thinking of making that a non-romantic path. Sure they'll be getting closer and having time together alone, but it's more of a family bonding time with someone the MC is comfortable with (and at the same time revealing good plot times). I guess it's not really trolling because it's not super mean, but at the same time if that guy has fans (not that I'm sure he will at first) they might get angry that it's not romantic...haha. Well hopefully by the time it comes out this thread has disappeared from the sea of obscurity hoohaha
(for the record though, it isn't just because he's her first cousin that this is non-romantic...)
I'd like also think a way of subverting is making romance not the main priority (even though it may seem like it). In another of my ideas, I was thinking that maybe the MC of that story will try to pursue her career over the love interest and not make it a bad end.
Actually I just think that pulling otome games out of the 'romance this guy and you'll have a happy love time forever' is a subversion to the genre. It's just the way it's portrayed is depressing...like papillon said, there's definitely more games to look for that should be more popular than the otome games we see here.

c
Sorry I wrote too much. I think I repeated a lot of what people said, but to be honest, as I've said, I've been having similar concerns, although I do enjoy otome games as they are (to an extent).