Welcome to Geekhack!
Skull Squadron was made by PMK, but it is Matt3o's design and generally they won't re-run it without his permission.
One issue you will have finding keycaps for the Filco is that teeny space bar and the two 1u Shifts. Ok, two issues
)
A lot of recent sets are starting to cater for more non-standard layouts, especially DSA sets as the keycaps are all the same profile and thus can go on any row on the keyboard as long as they are the right width.
Maybe have a look in
interest checks and/or
group buys and see if any sets grab your interest, then check or ask if they will support the Minila.