Really nice set, but may I offer my thoughts on the modpack?
You mentioned that you want to avoid an expensive set; therefore, you don't include all that many keys, but here's what I find confusing:
Just exactly how many people use a HHKB layout? Adding all the Vipers and KMAC Happy and what nots together, do we actually have enough people to include the keys in the modpack... say VS the Cherry 1800 layout?
I find a lot of these packs don't include keys to support the 1800 layout, and would love to see it, it's just three extra keys:
1x "+", 1x "-" (different profile), 1x "0"
If you ask me, there are a lot more people with the 1800 layout than the HHKB layout, so would you consider adding those 3 keys to the modpack?