'New Topic' button in locked categories

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We have a use-case that needs this too: making topics public 3 months after they have been created.

I thought a good way to do this was to have

  1. a public main category for the old posts (Everyone can See / Reply only)

  2. a restricted subcategory (TL_0 can Create) with an automatic move of the posts after 3 months.

  3. automatic script to move the topics from the sub to the main once creation date is 3 months or greater

The problem is that the + New Topic button in the main category is now greyed out for my logged in users. While I could simply tell them to post in the subcategory instead, I’d much rather keep it clean by:

  • Replacing the greyed out + New Topic button in this category with a functional one for all logged in users which opens the composer with the desired subcategory preselected.

Any idea how I could do that?