two questions about the interaction of those
1. Can Metamagic be applied to focus spells as usual?
2. Can Metamagic be applied cross-class if you learn it via Dedication or as Dual-Class hero?
My first instinct says yes to both but I am not quite sure about it.
Yes it can, the Mercy feats from Champion are actually metamagic per example.
I personally like Reach spell + Lay on hands as well.