lovefromisrael I read your guide and it's great. But I do have some comments.
You say that you don't like non foss apps, so why did you download the Google framework?
Where did you find the American version of Pixel in Israel? חשבתי שמוכרים את זה רק בחול
According to what one of the admins wrote on this forum not too long ago, the reason graphene doesn't have a permission to allow apps to connect to the networks only at specific times, is because apps have a line up what they want to send to the server while they are offline and send everything when they get online.
Also, it's not clear from your guide if you know this, but graphene OS only works on Pixel phones. The reason is because pixel phones let other operating systems also lock the bootloader.
The timer and clock that come with Graphene are the default AOSP version. You can find many FOSS timers and clocks.
Even if you don't want to use Gboard for Hebrew without network permission, there are many FOSS keyboards that have full support for Hebrew.
Where did you have the issue that the screen and the words are both black?
Graphene OS fully supports 5G, it could be though that you disabled it in your settings. Check if 'LTE only' is enabled, if it is, disable it and 5G will work.
I'm not sure I understand exactly what your issue is with recorders, there are many FOSS recorders that I'm sure are very good.
זה מאוד חשוב שיהיה תוכן על גרפין בעברית אז תודה רבה!