Fairly good list Craig. I'm assuming your French heavy weapons is late war. Much as I'd love to see Greeks, Romanians, Montenegrins, Portugese, Belgian colonials and a number of other units I do think your list hits most of the potential high demanded sets.

That having been said I'd suggest adding the following more marginal sets:

Serbs-Yes we have the C&S but we can do better, and they would provide good opponents for early war Austrians.

French alpini-Perhaps they could be combined with the early war colonials you mentioned.

Brits and Indians in tropical clothing that could be used for campaigns in Mesopotamia, Egypt, Galipoli, Salonika and Africa

Generic askaris-I have zero interest in this and I'm not even sure if such a set COULD be done, but if so I can see several potential uses.