Here's some of mine:

PROCESSION OF THE MACHINE GOD

Friendly TECH-PRIEST models are treated as having the BATTLELINE keyword for the purposes of the abilities of friendly units.

It could have stratagems and enhancements focused around tech priests that make them the core of the army instead of skitarii.

RAPID AQUISITION CONCLAVE

Whenever a friendly KATAPHRON or SICARIAN unit destroys an enemy unit, it may make a surge move.

Focused around speed. Maybe an enhancement that lets marshalls lead sicarians.

ENHANCED AUGMENTATION CORPS

Not sure about the rule but i like the idea of units getting access to untested archaeotech that is crazy powerful but has hazardous.