I doubt it would happen becaus ethey seem to want to accurately replicate the show chest designs, but if they made Den-O's visor rotate upside down and become the chest, it would actually reasonably match the chest enough and give us a different transformation.

I've never bought any KR driver before, but because Gaim is cool as hell I am considering getting the Sengoku driver. For those who have it already, is it worth the money?

Pretty much :D

Its like Ranger Keys, I'm may not have them all but I want them all.

The female peach rider would work...if she wasn't an Energy Rider (unless Energy Rider toys can somehow use the Arms Change gimmick).

Legend Rider Arms would be easier since it's only ten. Plus maybe some additional entries. If they keep the four pack idea, they could have most everyone significant done in three or four more?

It could easily break down like this:

Kuuga
Agito
Ryuki
Faiz

Blade
Hibiki
Kabuto
Den-O

Kiva
Decade

Meteor & Beast can fill out the 4th set since they have locks coming. It would be a simple matter of taking some of the more popular secondary riders to make more sets too:

Gills
Knight
Kaixa
Gattack

Zeronos
Ixa
Accel
Birth

If Bandai say no, i say somebody gets on kickstarter

If you like things that make noise, yes.

Owning Den-O, OOO, Wizard and Sengoku myself, and having owned a few more in the past, I'll say this... the "value" of it is really contingent on YOUR enjoyment of it, to be honest. I think, personally, that the Sengoku Driver is really good. The Lock Seeds have a ton of noises, and you almost don't even need the driver to have a ton of fun with them (though it sure helps).

LED Decade Lockseed Demo!
https://www.youtube.com/watch?v=GymN2VpDgno

Gone now, but the Legend Arms Change set was on Manda for 2000 yen just a little while ago! The Legend Lock sets themselves are popping in and out anywhere from 2000-3000 right now too.