if you want to mass apply protection, i find a hammer a more useful weapon. the chain plants a symbol that grants protection to your allies inside the symbol. you can trait the symbol to be larger and heal. with the combofinisher on hammer you can also grant retaliation. the only people needing protection are the ones that are close enough to the enemy to get hit by it.
it also allows you to immobilize enemies and place a ring that keeps enemies inside/outside.
i think you should swap out the sword/shield for a hammer. the defensive skills on shield have a too long cooldown to keep up protection as much as possible.
you would also be able to take the 20% 2H mastery trait, since it would benefit both hammer and staff, giving you more empowers.
i also think that inspired virtue is very useful for a build focussing on boons. it gives your party boons when activating a virtue. if you want aegis, you'll be activating virtue of courage anyways, it's useful to also get protection then. your virtue of resolve applies the regeneration you wanted.
so i think what you're aiming for can more easily be achieved with this build:
also, pick different runes. i added 4 runes to the build editor (water and monk), as you want to be aiming for boon duration.
the last 2 rune slots can be filled with major rune of sanctuary (not superior) to add another 20%.
you can also instead use superior runes of earth, for added protection duration (although if you do you might be going overkill on the protection)
i hope this helped