As per Rules we just need to develop a written scope for them if they are to be voted in as a formal Sub-Committee i.e. what is the composition of the proposed group, what are they intended to cover, outcomes expected, reporting requirements, etc. From a financial point of view will they have any costs so do they need a budget?
To spread the workload perhaps to start with we shoulder tap some non-ExCom person to develop an initial proposal for the creation of the Sub Committee and as part of that possibly contact Rangitikei to see how they could contribute ,then put the developed proposal, i.e. scope, to ExCom for voting in..