tabs – as you’ve inadvertently backed yourself into a corner, all you can now do is minimise your costs by doing as KiwiPaul suggested, and ensure that the wording of the proposed Special By-Law (SBL) is kept simple (in plain english), straight forward, and to the point of what’s required at least for your Lot, and if you can include whatever’s appropriate for other Owners, all the better.
Your Strata Manager and Executive Committee may wish to engage the services of a Strata Lawyer to prepare and register the SBL, but in my opinion that’s not necessary for such as straight-forward matter, particularly as the costs of the DIY approach that’s been suggested amount to $102 for lodgement and registration of the SBL on your Plan’s Strata Title by NSW Land & Property Information (incorporating the former Land Titles Office) using THIS form.