Thanks for the suggestion, Matthias.
Would it work for you to create (for example) a Cask label template and a Keg label template (Breww already supports this feature)? These could be linked to the specific container types so the correct template would be used each time automatically and you could make each one show different text.
If you don’t think that Customising what is shown on stock labels with custom templates is the right option for you, could you let me know why so we can ensure that we build something that would solve this for you?
Thank you.