The best strategy would be to talk to them asserting that the assets are charged to secured creditors, if applicabe, and that the company is seeking to maximise all creditors’ interests by proposing a CVA. Payment of their outstanding costs can often remove the pressure whilst not actually paying the petitioning creditor’s debts.
In extreme cases the debt itself may have to be repaid. If the amount owed is too high then the company may have to enter administration to prevent the legal actions escalating. However this is an expensive option so exhaust all others first.