Associate non-named functions to a high level group

Heime <[email protected]>
Newsgroups gmane.emacs.help
Message-ID <mepeu8zi7R3lE9ByBOxs5QPmim61F_0iNg0SySPr2WdRt0fvab7XgHAFrJAIvdjrni7TsjFPwFZ5qwnZxoIeHD8foe-BxsISABpb8TyPe-E=@protonmail.com> 
While defcustom can use :group 'lana to organize variables for 
discovery via M-x customize-group RET lana, interactive functions 
lack direct group association - especially when names like 
mos-normalise-pathname omit lana.

What framework can I introduce to associate such functions with 
the lana group, filtering M-x completion or describe-function 
lookups to show only lana-related commands regardless of naming?
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