Actually, the post below gave me an idea for a Retribution talent:
Spirit and Steel (5 points)
Requires 20 points in Retribution Talents
Gives you a 4/8/12/16/20% bonus to Physical and Holy damage you deal for 8 sec after you cast Holy Light or Flash of Light.
Gives you a 4/8/12/16/20% bonus to the amount healed by your Holy Light or Flash of Light for 8 sec after you deal a damaging melee attack.
The truth of a paladin is that whenever you cast a healing spell, your damage-per-second goes down. And whenever you swing your weapon, your healing-per-second decreases. And it is this trade-off that causes most of the problems for paladins who want to melee.
This talent offsets that loss. Healing feeds damage, and damage feeds healing, which is how it should be for a paladin.
You could tweak the numbers, or even make them dependant on each other. The amount of extra healing could be determined by the amount of damage done by the last melee attack, and vice versa (though you'd have to be careful about getting into a positive feedback loop). But I think this might be a decent way of getting to the Vampiric Embrace ideal, without directly copying VE.
Edit: Clarified the dependancy idea. Also changed it to a five point talent and reduced the duration slightly.