A much simpler way to go about this may be to lease the property to the owner in a agreement that lasts for the life of the strata plan, then allow them exclusive use under a by-law.
The lease would reflect the enhanced value of the apartment and the increased proportion of unit entitlement that would otherwise have to be calculated and registered. It could also be linked either to CPI or to an agreed periodic valuatuon of properties in the whole building.
The by-law would shift responsibility for repairs etc to the owner. They would have security of tenure under this arrangement as exclusive use by-laws can only be rescinded with agreement by both parties.
All costs would be borne by the renovator and this method would allow everything to be done above board without the miles of red tape involved in doing it “properly”.
As ever, of course, someone at some point need to talk to strata lawyer.
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