Hey there from Victoria.
Could a $1 per annum (say) licence agreement work here? (i.e. you each pay one another $1 each year). Only cost is drawing it up with the lawyer (shared cost – couple of hundred dollars maybe?) and it might have some notional expiry of xx years and early termination by agreement? Not sure if it can be designed to endure past a change in property owner??
I’m not a lawyer, but I did have a licence agreement when I moved into my place before settlement. That was a pretty simple document and might work here. It wouldn’t involve the strata manager at all, you’d essentially be tenants I would think? I’d talk to a lawyer, maybe one that does property transfers and is familiar with this territory?