None of them are dangerous solutions just non optimal
V1 I turned the screen on and off when the backlight started up
v2 I noted the lcd code is using a static bool variable that is only implicitly initialized
basically the compiler is expected to set it to false but since the bootloader already
used this variable it is possible it is already initialized to true
v3 turn the screen off and on again right before rockbox loads the main menu
v5 the lcd_enable command blocks if already set to the same state so if its enabled it won't re-enable it
There are two different displays for the clip zip and I'm guessing you have the rarer undocumented one
With no device to test its really hard to write code for it so the best I can do is write code that doesn't affect other devices negatively
AND hopefully fixes your device
Could you try one last build I noticed there has been a change in the code between 3.13 and 3.14 on the backlight initialization
again in the name of power savings could you try this reversion of
http://gerrit.rockbox.org/r/#/c/989/https://www.mediafire.com/file/4hj1ao2lm1nzwq8/ClipZip_Corrupted_displayV7_2-28-20_rockbox-full.zipHere is the patch if you are interested in seeing it
http://gerrit.rockbox.org/r/#/c/2303/