You can easily copy the Russian OoB into the Red OoB and then using shpedit replace the Red flags with the three flag .bmps above (in battle.shp, Icon0095.shp and Icon0097.shp respectivley).
There is a useful "how to guide"
HERE
Note: The flags I provided are to modify the vanilla/original game - New versions will be needed if you use the "roundel" objective mod or "small ID flag" mod.
If this really is too daunting a prospect please PM me and I will dropbox/email you the .shp files
