Bump
I suggest you ask around for a Deck/ TG3 spacebar. Lots of people have that TG3 police keyboard, which has very little market value. I'm sure they can give you that 6x.
I also have, but I am very reluctant to sell because I rotate and play with my TG3s. Unlike these people I didn't desolder mine to sell the switches.
Due to difficulty of getting the spacebar I strongly recommend you consider a standard size. Remember, when you produce the PCB and want to look for others to join the group buy, you need to convince people that they can find the keycaps easily.