Mills style webbing was worn in Brazil and Spain in the 1920s. Peaked caps were a feature of the uniform in the former. Rest of the uniform won't match. If you are looking for ideas to use minis, then you will struggle, equipment and small arms tend to be much confined to the Empire and Dominions. In addition to the Poles and Russians, the Baltic states were the recipients of large scale largesse in terms of British uniforms and kit around the time of the RCW and early 1920s.