I did notice your HR of allowing spellcaster t…

I did notice your HR of allowing spellcaster to cast level 2 or lower spells as a bonus action, how would you handle a Quicken Spell for this rule?

Question I recently found critical role and already put in 200+ hours watching it so good. I did notice your house rule of allowing spellcaster to cast level 2 or lower spells as a bonus action how would you handle a sorcerers quicken spell metamagic for this rule?