As someone who generally only plays popular styles of music, to begin with, Gb major/F# major and their relative minors of ebmin/d#min, fortunately, are not that common.

Several things come to mind about keys. Either you can sight-read the chart, or you can not. Either you are willing to play it in that key, or you are not. If you can and will play in that key, then it does not make much difference. Many things one has to do in music is a PITB.

All this 24/12 stuff to the vast majority of guitar players is meaningless, to begin with. Most don't or, more likely, can not site read.

Here are a couple of examples of why sight reading for guitar is a pain in the...

Example one


Example 2


How many of you would know that example one is to be played in "Chicken Pickin' style or example two is "Travis picking? Sure, someone would most likely tell you that but would you then know how to read the chart?

Yes, highly skilled studio musicians guitar players do this every day.

There are many ways to communicate musical ideas that have nothing to do with classical training.

Ebmin, six flats, why would you write in that key to begin with?

Billy

“Amazing! I’ll be working with Jaco Pastorius, Charlie Parker, Art Tatum, and Buddy Rich, and you’re telling me it’s not that great of a gig?
“Well…” Saint Peter, hesitated, “God’s got this girlfriend who thinks she can sing…”