That’s a good question sir.
Previous Steam Early Access titles offer them as individual purchases, and do not carry over the difference into an upgraded package (i.e. if you buy the 9.99 it wouldn’t make the top package discounted to $40.00)…
But, even if you can buy the $9.99 just to secure Early Access, I don’t know how IMC would handle it if you were to also buy a $49.99 package. (because then you get into the realm of “well, if you can buy multiple packages, will I get the items for each?” and “What happens if I buy 10x of the $49.99, does that mean I get 10x of every item in the package?”)
I guess we’ll have to wait and see. Maybe we’ll see an item redemption code/voucher with those packages that ties to IMC so only one can be redeemed per-account.
No idea mate =)