Your plan sounds like a good compromise.
Find out the mechanisms (by-law, Executive Committee ruling or building management decision) by which the designation was established and then removed. The removal may not be permitted if, for instance, it was designated in a by-law.
Then propose a motion for the next EC meeting or AGM re-instating the designation with the restrictions you suggested.
If you need help contact an advocacy service like City and Inner West Disability Advocacy, Suite 8, Level 1, 330 Wattle Street, Ultimo NSW 2007. Tel 1800 629 072 or 02 9281 8699