Garthanos
Arcadian Knight
An ability that gives initiative bonus always on, is less fiddly and if 5e is shooting for that it might be better and duplicates 4e and it sounds like 3e.(can you use a reaction when rolling initiative?)
One if the Marshal's Minor Auras added his CHAmod to allies' DEX checks, including Initiative. So that certainly sounds reasonable.
Of course, all the Marshal's Auras gave bonuses, so we might need to be careful about BA.
The Guidance/Bless +d4 might be one way to go.
But I do like the swap initiative idea for its tactical element.