If I were on your strata committee and chairing the AGM, I would include the requested motion. However, I would put it late on the agenda after all necessary items and make it clear to members via the agenda that I will not tolerate more than a few minutes on this item.
I would include a statement under the agenda item that: ‘This proposal does not appear to be substantially different from proposals put to four previous general meetings, AGMs in 20xx, 20yy and 20zz and an EGM in 20aa. On each occasion the vote fell far short of that needed to pass a special resolution and the current committee is unaware of any increase in support for the proposal. Consequently, the chair will allow only a few minutes for the proponent to explain any differences in the current proposal or change of circumstances that might increase support. The chair then will allow a few brief responses from other members before closing discussion and calling for a vote.