tanking a beholder without cheese

Assume you are playing no-reload, so you cannot afford to just 'wing it' for a bad saving throw.

How can you reliably tank a beholder/elder orb WITHOUT using the Shield of Cheese or the Cloak of Cheese?

[theoretical]
Figther/Mage -> Spell Immunity: Nec/Evo/Abj + Spell Shield + Prot. f Petrif.
(does Spell Shield stay up?)

Any other reliable methods?