I’m not a builder, but maybe an RSJ (rolled steel joist or I-beam) cut into the wall should hold it, then add the fancy stuff later. Amazing what you can do with an angle grinder and a mallet.
But seriously, it’s worth reading this factsheet. It starts off about wheelchairs but moves on to say this:
There is no obligation on a body corporate to specifically go and do things to make the building compliant with the various codes for differently abled persons. If it was up-to-code when it was built, it remains that way unless someone raises it as an issue.
The question of whether or not a body corporate has a duty to modify common property to facilitate easier access for residents generally depends on the answers to the following key questions:
(a) Are there disabled residents in the strata scheme?
(b) If so, is the requirement for those disabled residents to travel through the presently available pedestrian routes on common property to get to and from their lots not reasonable having regard to the circumstances?
(c) Would the modifications to the common property pedestrian routes requested by disabled residents impose unjustifiable hardship on the owners corporation?
If a resident needed something upgraded to suit their circumstances, then their request is likely to be successful.
Food for thought.