That application, if not interim will probably take around 3 months or more at present. If you don’t have a letter from a strata manager agreeing to the compulsory appointment, that application will most likely fail anyway.
Aside from JT’s recommendations you could approach 2 new strata managers and request quotes/propsals.
Also ask them for the correct motions to put on the EGM notice in order to accept their proposal.
Call an EGM to approve one of the proposals.
Make sure everyone has a copy of the meeting notice and proposals 14 days prior. You will need have all the required statutory motions as well on the agenda.