Well since this topic is starting to look like a wishlist, i would like to propose the Greeks.
A complete expeditionary corps went to Ukraine between January - May 1919 to fight against the forces of the Russian Revolution.
Evzones with pom poms in their boots, khaki skirts, ( sorry the white ones were out of service in 1914-5 ) Ruby M1914 pistols, Mannlicher-Schönauer rifles, Chauchat, Schwarzlose, Hotchkiss M1914 machine guns, Schneider-Danglis 75mm 1906 artillery e.t.c.
Also extremely flexible project since everythink can be used for WW1, the Asia Minnor campaign even up to WW2 !
Unique and rare addition and mr. Copplestone can start from scratch !
There is hope ...