Can I get a perdiem job to augment my regular job ? Low census can destabilize budge. Lesser commute would be the best.

I did through an agency in a school nurse position. Believe it or not it became a permanent full time position . Less stress and anxiety, I have since retired but I found my last position as a nurse quite rewarding

Of course! Why not? As long as it doesn't 'interfere' with your regular job, your employer can have no problems with it or do anything to prohibit you from doing it.