Cap'n Kobold
Hero
I'm not seeing the need TBH. I do not view spellcasting in stealth is not a vital part of the Ranger toolkit. If you want to play some kind of outdoor, guerrilla, stealth warrior without spells, you can do that, but if you want the power and utility of spells by playing a Ranger, you should be subject to their normal restrictions.As rangers are should be some kind of outdoor, guerrilla, stealth warriors, and WotC obviously cannot make rangers without spells,
Rangers need a new 1st level ability, same as aberrant mind sorcerers and their psionic spells.
New ability:
Covert spellcasting:
Ranger can cast spells that are prepared/known by ranger class with ignoring Somatic, Verbal and Material components that are not consumed in spellcasting.
If you want to stay in stealth as a Ranger, you can just . . . not . . . cast a spell.
I'm not a fan of giving out free subtle spell metamagics. Spell components, including them making it obvious that you are casting a spell, are some of the few restrictions that spells still have.