[kianduatha]

Remember that if you make katanas or Samurai armor better/cheaper for Jomon, it'll also buff Shinuyama.

If you want to lower Samurai Archer resource cost, just give them a Yari instead of a Katana. Bam, down to 17 resources.

Also here's the thing about Samurai Archer stats--they're lower even than those of indie Longbowmen, who at least get 11 Str and 10 HP. Incidentally, giving Samurai Archers Yari solves the problem of 'why would anyone buy anything else'--their weapons would be different.