[Chimera-users] renumber model IDs

There are a number of times I would like to change the model ID numbers. Sometimes it is because a researcher gives me a session file that has sequences like monomer-b, monomer-d, monomer-a, monomer-c; or sometimes when I got an easy sequence to memorize (monomer-a, monomer-b, monomer-c, monomer-d), I do a colorzone split map that causes sequence names to comeback in a different order (monomer-b, monomer-d, monomer-a, monomer-c). Is there a way using commands to maintain better ID order?