Day One: The Cooldown Build. With the below glyphs, one guardian-spirit-Glyphed Holy Priest (10 second coverage, CD reduced to one min if not activated), and two 20sec/2minCD trinkets, you can continually have a trinket/CD used. 100% Uptime (with even a little overlap from shield wall being 13 sec, not 10).
Defensive Build (5/8/56, Imp Disciplines, Imp Reflect, 5/5 Demo)
Glyph of Blocking (Optional)
Glyph of Last Stand
Glyph of Shield Wall *new* -- Reduces the cooldown on Shield Wall by 3 min, but Shield Wall now only reduces damage taken by 40%
10 Sec CDs are Shield Wall and Guardian Spirit.
20 Sec CDs are Trinket1, Trinket2, and Last Stand.
Shield Block, 10 Sec CD B, 20 Sec CD F
Shield Block, 10 Sec CD C, 20 Sec CD D
Shield Block, 10 Sec CD B, 20 Sec CD E
Shield Block, 10 Sec CD C, 20 Sec CD F
Shield Block, 10 Sec CD B, 20 Sec CD D
Shield Block, 10 Sec CD C, 20 Sec CD E
This build gives you the benefit of a trinket, last stand, shield block, shield wall, or a death-preventing / heal increasing guardian spirit, at all times. Clever use of /in macros and castsequence would make it fairly easy, and the requirement of a single holy priest is fairly reasonable for progression.
I'm pretty excited about it.