Went into this thread with a "oh here we go again" type attitude, ready to facepalm.
However, I was wrong - your ideas, frankly look amazing. I'd totally welcome this as an addition to the DK arsenal. The reason I like these ideas so much is probably because it wouldn't be another "stand and heal shit" type class but a support role that could still deal moderate damage while bringing some interesting and useful raid cooldowns. Summoning healing valkyrs, exploding minions to heal people, healing (or maybe shielding, disc style) with death coil.
Love it - well done.