Hi @IanManning , welcome to the Meta!
You can take a look at this similar topic, it may help:
You could, (IIRC) like what OP said in that topic, increase the requirements so high that it cannot be reached easily (or not at all?).
This may not be necessary, since TL4s have to be manually promoted, so you can promote them only if you trust them to use those permissions, if not, don’t promote them at all.
I hope this helps!