Doesn't the way haste is implemented already give everyone access to action surge?
Barrelmancy alone in early access makes spellcasters pretty obsolete. Until level 5! The largely meh scrolls are just the icing on this barrel cake.
You see, nerving scrolls will not restore balance to the classes. A sorcerer can cast 4 fireballs in one turn because spellcasters /do have action surge/ in practice. I won't be crying about Astarion using the situational thunderwave, while absolutely everyone can use magic cantrips and classes who should not be further named are forces of destruction.
The balance is so out of order, the spellcaster vs. melee issue is a joke. No use getting upset over that. Just give me a game where every class is functional and actually excels at their speciality.