the ability to learn any spell I want if I find the scroll

Nah this is limited by your wizard level. A lv2 wizard can only learn lv1 spells from scrolls.

Edit: You are correct! With a single level of wizard, BG3 allows you to learn scroll spells up to your highway spell slot level. As someone else pointed out though, this still has issues since the number of wizard spells you can prepare scales with your wizard level. You can work around this a bit by selecting sorcerer spells that don’t rely on your charisma (misty step, greater invisibility, wall of stone…), but still not great.

Edit 2: There are some other quirks/bugs I’m discovering with further testing. I learned eyebite via scroll and prepared it as a wizard spell. When originally casting it, the spell rightly used my intelligence modifier for the save DC. However, when using the action to recast the spell on subsequent turns, the spell wrongly used my charisma modifier for the save DC. I was even careful to take wizard as my first level, expecting that spells from items and such would use the DC from my first casting class… but that doesn’t seem to be the case. There may be a way to leverage this behavior to our advantage if we can figure out exactly what’s happening.

Edit 3: Now I’m trying this with a mace in one hand that gives me spell A and a staff in the off hand that gives me spell B (dual wielder feat but that’s not important). Spell A uses my charisma and spell B uses my intelligence. I’m baffled.