Uuuugh. Had an idea for glitch testing. It ended up turning out...
I do the invincibility glitch and then press Deku Stick. Then pause, then equip something else. I thought it might use whatever Item I put there like FW anywhere or something... and maybe it can, I'll have to test it with FW. But one thing is certain, after equipping the deku nut (or whatever item) over it, I unpause and it pulls out the deku stick a while later WHEN THE DEKU STICK IS NO LONGER EQUIPPED! WTF! Later spamming the deku nut will throw a nut. IDK where it stores this deku stick value after deku nut has been written to the C button! (less info)