If possible, the same charm as the first season of Akibaranger but applied to Kamen Rider. And maybe some Akibaranger throwbacks or even a crossover if they can be clever with it and pull it off really well.
But an Akiba Rider would be amazing. Personally, I'd really like to see it be a pair of double Riders, one being a huge Showa fan and one being a huge Heisei fan, that work out their differences (born from their differing interests) and learn to appreciate that both are great or something. And maybe they make jokes about how the Heisei fan is significantly poorer because of all the merch compared to the Showa fan.