Like I said before:
Only Haste, Temper and Refresh II would be worthwhile with Accession. WHM can do the Gain line already fine, and you'd be better of leaving RDM's at single-target just make it party targetable if anything to give say THF/DNC and so on DEX while the white mage gives the rest another one.
Haste + Temper would end up being the only ones used, and if you were in a mage party you'd only use Refresh II and possibly Haste. A mixed party you'd just cast Refresh II separately, Haste if it's mostly mages.
You can do fine with RDM with only two stratagems unless the enemy dispels.