Using CLI to build v1 config files

Is it possible to use the cli to run v1 config files?

We’re migrating three projects (each with their own circleci config) into a monorepo and I’d rather not have to merge/upgrade the config files to v2 at the same time.

Was hoping I could have a root config file that used something like circleci build --config ~/mono/project1/circle.yml to run each project manually.