Since no-one has themes on GHNS that'd benefit from this, mainly because either the themes stand on their own with their own splash screens independently, just use the default Breeze Splash Screen, or the L&F creators probably tried but noticed that their Splash Screens didn't apply properly on one of their L&F variants and gave up, I'll upload the main Feren OS Look & Feel variants here for testing purposes:
{F7364393}
Look & Feels taking advantage of the Latte Dock layout changing and BorderlessMaximisedWindows options will be added to the Test Plan in a later edit.