I never clear coat over white.Interesting - why don’t you clear coat the white?
Could imagine that the difference between clear coated and non clear coated will be visible…?
Many years ago when building plastic kits forum members warned me that they can 'yellow' over time.
Case in point - my Ottomobile works RS200 rally car was painted white and then with a clear coat, and it's very obvious.
Instead of a strong white it has an ivory tint which on mine wasn't very even, so that some parts are worse than others.
I normally clear coat all other colours, expect some silver/aluminium metallics, where the metal flake effect is smothered.