That looks like an interesting strategy, I would have to get/paint a celestant but that should not be a problem. I do have the Dais Arcanum but was under the impression that LA cant use it. Unless there is an errata I missed? The scroll says it cant be used by units with 6 or more HP, LA has 6. I could also ditch the Pendulum and take Asteia Solbright instead of LAoF, I would not run Hammers but she still looks strong without he CA.
If LA can hop on dais with staunch defender would that not make him almost invincible except for mortal wounds?
Could you elaborate on what the other half of the sequitors would be doing during that battle. I'm assuming camping my base objective.