Thanks once again for giving advice. I removed R3 PgUp, R4 PgDn to keep the price down, but I will keep it in consideration as well as the 2u shift.
Another thing to consider as far as cost-cutting measures go is dropping mod-colored pipe and tilde. Generally speaking, I would very much be against this, but in this case, with this particular colorway, they're sufficiently similar to the alpha-colored ones that removing the black legend variants
may be worth considering.
However, none of these three things will make a big pricing difference in isolation. Sometimes, they don't make a difference at all — in other words, the final retail prices may end up being the same irrespective of whether or not you include one or two extra keys.
That being said, as far as value per key goes (not in terms of price, but usefulness), I would say that R3 PgUp, R4 PgDn are valuable way more than 2u Shift, but less valuable than mod-colored pipe and tilde.