Oh you know what. ...I just managed to solve it!
Disabling all animations through developer options indeed stops the screen off animation. Leaving Window and Transition Animations Scale set to 0 means that no animations appear when loading apps for example, however by keeping Animator Duration Scale at 1 it keeps the CRT screen off animation. Job done!
Shame I had to create a thread to solve this so quickly but least if anyone else wants the speedy interface of having no system animations but wants to keep the CRT, they'll know how!
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