I think I should be able to do composer require drupal/migrate_devel:dev-3.x or composer require drupal/migrate_devel:dev-3.x to install the 3.x branch. However, Composer is unable to find that version. It does list earlier dev branches as options.
If I understand correctly, a maintainer needs to create a release for the branch so that Composer can see it.
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Comment #2
batigolixNot sure if composer require drupal/migrate_devel:dev-3.x works.
I created a new version, so at the next composer require drupal/migrate_devel or update you should get version 3.0.1
Thanks