There's no way not to make it forced, though. Any pairing of the main male and female character in a show is forced - it's treated as the "default" relationship in 99% of media, plus we're coming off two Rider shows where the female lead was heavily pushed as the hero's love interest. "Chemistry" doesn't need to be romantic ALL the time
What are you talking about? Since when did Kouta have any love interest for Mai, or Mai for Kouta? They only ended up together because they had to (I suppose..). The only legit romance in Gaim was that of Kaito and Mai. -You can include, hardly though, Takatora with Kouta's sister as it seemed like they had quite the date in the last episode- Like you said.. "Chemistry" doesn't need to be romantic ALL the time... And there's nothing romantic between Kouta and Mai. Heck, there's barely any Chemistry in there... Mai was just the holder of the fruit and the "prize" of the person who grabs it. Kouta would happily give the apple to Kaito, then we'd have Kaito x Mai...
As for Wizard, I'll agree that they pushed them together, but come on... It's not like we've got any actual romance in Kamen Rider... Or at least after Hibiki, as I don't know about the previous seasons. That excludes Kiva, of course. At least we have some proper development... They slowly start falling for each other, but don't admit it. And it's even more interesting because we might get a love triangle here. I really want to see how it'll go... Will they end up having a roidmude with a human be together? Or does love for Tomari find its way to Kiriko's heart? Not to mention that we also have Gou who supports Tomari, but doesn't even want to have a slight thought of Chase being with Kiriko.
But anyway... You gotta remember that Kamen Rider is also aimed to teenagers... and you know how the typical teenagers are... To me, as a teenager, romance goes to far most of the times, especially in American shows were it gets serious as Hell. So don't think I'd like it for the leads to be together in every show... especially in such a show. But you gotta understand that we really haven't gotten this much. Sure they've dropped the hints in Fourze and OOO. Kabuto and Decade. But did we ever actually see them having any "deep" connection like Haruto and Koyomi had? I just don't consider them as such.