I am working on this now, so this is WIP. I have a 100 paladin and then 4 level 22 ones that I need to bring up, so I immediately ran into trouble with trying a castsequence because the low level dudes were missing half the spells.

My ISBoxer 2 step solution (for the moment):
Step 1:
Shield of the righteous
Step 2 (Wait 12 seconds before going back to step 1)
Cast all of the following (as their own keypresses coming in)
Eye of tyr
consecration
avenger's shield
judgment
hammer of the righteous

This catches procs for avenger's shield, and a side benefit for me is that for the lowbies, any abilities they dont have yet just get ignored.

As I get past leveling and into some "current" content, I'm sure this will change. I will probably have to be more judicious with my SOTR etc.

Should be good for now.