Couldn't we had 'fullscreen custom logos' before?
Why did you choose to leave the message of the "svb_orange"? We all know bootloader is unlocked, message is useless and undesirable since boot continues anyway after a few secs (no need to press power).
Anyway, that's what I've done on mine, replaced it with a nice screen, acting as second (boot)logo.
We could have used full screen, but it would have looked like this cause the image is still there, just blacked out.