I'm not usually the guy going in ICs and criticizing things but I hope you get this criticism as constructive, as a respectable user you are.
I don't really get this type of sets, first of all BLANKS with GMK doesn't make much sense, even if a GMK cap is top notch you still usually go for them for their awesome doubleshot, because for blanks we have other options, imho doesn't make sense due the GMK price to go for ABS blanks. Plus to this you are adding a strict color, something that you probably know is not for everyone, without even mentioning the uniform color (nothing particularly great).
I honestly kinda doubt we should run these sets via GMK, pretty hard to hit the MOQ if it will be 150 as usual and even if the MOQ will be lower because they are blank or for whatever reason, the price will still be ridiculous for what it is (thick abs blanks caps). Mondrian was like $80 if i remember correctly and this should be more expensive than Mondrian, I would say around $90-100
The only thing in the set that i think could push people to buy it, is probably the R4C, but still i doubt it might happen at a 150 MOQ.
Also, if thick ABS blank caps is what you want, as another user suggested you might really want to go for JTK for half of the price of the set (at that price more people might be interested), since with JTK the biggest problem are the legends, while the cap himself is more or less the same thng (yeah i saw you said the finish on JTK sets isn't as nice as GMK sets, i just don't agree with that statement).
Just my 2 cents, please don't take it personal.