Crossover DLC let's goooooo! Also it would be super fun if Princess Ken ended up being a love interest herself, not for Grace, but for Kenzaburou. If she somehow recognized him from when he was playing that game and grew interested from that it'd be pretty interesting, esspecially since, being happily married, he's just entirely uninterested but also, being the good person he is, unwilling to be rude in how he turns her down.
Doubt it though, more likely is that if she does figure it out she'll be more academically interested than romantically. Still, fun to think about.