Just FYI usually the hand it outside of the spoiler solution.
The interesting thing about SFK and SFSS is they actually both place the same number of counters, but SFK loses flexibility because it requires that you have 2 cards installed. During a typical combo you place 4(EC) + 3(PV) + 5(GFI) = 12 advancements, meaning you only have to play SFK six times. The trick is therefore making sure you have everything installed as you need to do it.
Here is a solution with a spare slot for something else for 10 credits, the triple AD and the 6 installables seems to be overkill for saving this:
PS 1 **
sfmm JH JH EC 2 *
AD (BL, SFMM(JH, GFI, PV), SFK(PV, EC)) 8 **
AD (SFK(EC, GFI), SFK(EC, GFI), SFK(EC, GFI)) 9 *
AD (SFK(PV, GFI), SFK(PV, GFI), spare) 10
With BL in hand you can do it with only 4 installables and 13 credits, but you still need all 3x AD
BL 4 ****
PS 5 ***
sfmm (JH, JH/EC, X) 6 **
AD (BL, interns(EC/JH), SFK(EC, X)) 11 ***
install JH/X2 11 **
AD (interns(JH/X2), SFK(EC, GFI), SFK (EC, X2)) 12 *
AD (SFK(EC, GFI), SFK(GFI, PV), SFK(GFI, PV)) 13
worth noting that in both of these solutions I’m not using the EC clicks so there are probably much more efficient solutions out there.