Actually a shorter adaptation would be going the safe route.
What if it blows people's minds and is successful? If they use Decade, they are fucked either way. Too little footage and too many riders know no will know and thus not care about.
It'd be like Beetleborgs but worse since there's no more footage without going the expensive route.
The safer route would be to promote it as the second Masked Rider since that one was popular in ratings back in the day and just use the Kamen Rider name. Why keep on starting from scratch because you'll go nowhere and have no success? Just fund KRDK's staff and crew to make another Kamen Rider with the promotion of Saban and no matter what, it will be a hit. The biggest reason why KRDK failed is the same reason why Power Rangers tanked. No promotion, shitty times and a half decent toy line that came not at Christmas , but a crappy bootleg one in the summer.
Saban should give the crew a good look and swoop them up, take their work and make a new series.
Take a 50 episode series and start with 20 episodes with as much promotion as Power Rangers with toys and such. It does good, release more episodes/make more for the Fall.