In OK a will named a personal representative who is disabled and has transportation issues, what should be done to file & secure in less than 2 weeks?

Anyone can ask the court to be appointed Personal Representative, showing the Court that the nominated parties are unable and/or unwilling to serve, the Court will most likely appoint the person makeing the request or some alternate person.   If nothing has been filed, something has to happen.  If the matter is pending and the Personal Representative has been appointed but is not taking any action, they can give some other person authority to help them, or to have a Co-Representative appointed who is better able to take action to preserve the property and take other time sensitive action.  If a case is pending and there is a lawyer, call the lawyer to explore options to preserve the property.

Very little.  Usually when someone dies, the apartment must be vacated within 30 days or the possessions in it are considered abandonned.  If the estate consists of more than this, your probate lawyer can help the named executors who do not want to serve ask the court to appoint someone else.