Is it possible to make a "Start Id from" Config file?

The idea is to have Several temp worlds latter combine into 1 world. All with their own computers and computer ids. i would have no control over how many would be created. therefor for management i would like to change the starting Id to 1000, 2000, 3000, etc.

The use of this is very rare and limited and not worth dedicating much thought to. Therefore i have a question, is it possible to shift or change the ids of all computers in the world, i.e. shifting by 1000, therefore no computers will bug out for having the same id?

P.s. I may have posted this question before on the wrong version..... sorry.