For Dagger, I'd say the Ichigo Kunai/Needle Kunai.
Claw could be anything, Bazooka was mentioned, Mechanical Arm is probably Magic Hand, what else is there?

The robot half body claw got a lot of use from Toei.

I assume Scissors and Chain Array are just repaints of the modules from Fourze with the same name:
Chain Array
Scissors (Admittedly Scissors could also be a repaint of any sort of dual blade weapon that combines)

For Drill, my guess is it'll be the Drill Crusher Crusher (No really, that's its name) from Zi-O's Build armor. Although, there's also the drill gauntlets used by the Vicarya Magia from Zero One.

Spear could be any polearm prop Toei has, if I had to make a bet I'd probably say the Kagematsu from Gaim since they probably have multiples of them lying around.

Fire could be anything.

Propeller... Uh... maybe the Batrotor Blade used by Build RoseCopter?

They've gotten a lot of mileage out of old Fourze stuff.

I want to throw this out there.
I believe one of Geats upgrade forms will be called “Victory”.

source?

Wonder what’ll fit Buffa’s Zombie, Tycoon’s Ninja & Na-go’s Beat?

Geats has both Magnum and Boost. Surely there must be other Raise Buckles that oughta fit those three.

I believe their complete forms will be Tycoon NinjaFantasy, Na-Go BeatsGrid and Buffa ZombieMonster.

They already hacked the belt in full. There’s no pairs for any other Buckle.

From what I heard, Boost basically pairs with any other signature Raise Buckle, giving the same "Get Ready for Boost and [X]!" sound.