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I presume you are talking about sets of Infantry figures done in the same quality as the new British, Poles and Highlanders with that in mind these are my recommendations.
1. Austrian Infantry Hungarian styled in Shakos
2. Russian Musketeers in 1809 Shako still used well into 1812
3. Ottoman Infantry Nizam I Cedit
4. Belgium Infantry could be used as Portuguese Infantry
1-3 Have never been made before and 4 could be with some more figures.