Brainstorm:
I could maybe accomplish it by EXCLUSION
Default: collect 19
for numbers beginning with:
2, collect 7
3, collect 7
4, collect 7
5, collect 7
6, collect 7
7, collect 7
8, collect 7
9, collect 7
neatly leaving * to collect 19.
This just might work.
IT's a bit ugly but it just...