imap-like methods for changing key and value types of commands instances

[bplommer]

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[otobrglez]

Hey @bplommer! 👋

Can I please ask you to provide a more details, examples or references on this issue please.

Regards!