R1 End and PgDn can be moved from base to numpad kit since those are used for 1800 layouts.
You only need a single Alt Gr in each size in extension kit as it's used exclusively for the right Alt. I also don't see any need for 2x1.5u Fn keys.
ne ISO novelty?
Right now we are just estimating the demand for the numpad and ideally pushing it into the base kit if the numbers support it, you are completely right about the alt gr, we will be fixing this! As for 2x 1.5u fn keys, i have heard from quite a few people that this is a want that often isn't met so I am trying to push for it just for them.
As for the ISO Novelty, I am trying to keep costs down as much as possible for the buyers, however if there is enough demand I can definitely add something in!
Thank you for your support!