Perhaps a Simple DRK Solution

[BattleGrace]

a few things.

no tank will nor should ever get an ability that makes them take more damage, it completely goes against the role as a whole. weather it is for OT dps or not people will 100% use it at the wrong times. that right there is bad design at it's finest

you loose provoke, why would you want to loose provoke? sure there is the whole "make PS a provoke" but that is an utterly stupid idea, you would litteraly have a constant uptime on your new provoke, and yes i don't care that you COULD use other skills the fact is there are people who legit only use PS even when OT in VA, it's a shit design.
you want to take away defensive cooldowns why?

i will admit Invig would be freaking nice

do you realy expect keen flurry to make up for any lost cooldown? as it is it's worse then darkdance and at best better then using nothing, i for one wouldn't want to give up foresight for keen flurry. why give up guaranteed mitigation with Foresight (contrary to most idiots it's not to far behind Rampart) for keen flurry (a chance to parry) ?

lets be real here at best you gain internal release, second wind and invig that won't hinder your roles ability to do it's job at the cost of key skills that can litteraly stop you from raiding.

you want B4B so you can blow a cooldown that you will need just to take the same damage you were before? can you say design flaw?

what SE need to do is just design their jobs to stop using cross classes, why every tank doesn't have thier own taunt i will never know, why every tank has to use pally as a skill whore i will never know. is it realy that hard for them to copy paste skills and give them a differant name that you obtain while leveling?