My first thought is to find out why a motion that was compiled in consultation with your strata manager was then ruled out of order on the advice of the same strata manager or their representative.
That aside, the language is a bit woolly. “That consideration be given to look into …” does not require any action. It’s asking the committee to think about having a think about doing something.
A stronger motion would be something like: “That a sub-committee be formed to investigate the processes and costs involved in converting the SEPP55 Development Approval of the scheme to a standard strata scheme, and to gauge the level of support for such a plan, with the strata committee to report back to a general meeting within [insert reasonable time frame here].”
By the way, I’m not sure of the legalities here but the easiest way may be to dissolve the strata scheme, using the processes of Part 10 of the Strata Schemes Development Act which, initially at least, only requires that you make a proposal to the committee to which they must respond within 30 days.
Consulting a strata lawyer would be a good idea – getting the committee to do it and pay for it would be even better.