The Storm aren't really selling tickets to other teams games in that membership.
They're effectively selling a voucher that's good to redeem a ticket to games if there's excess availably. In other words it isn't a guarantee to a ticket to the games you want to attend, and the Storm can almost certainly honour the membership without making any arrangements with the other clubs.
What you were proposing, a specific seat at two specific away matches, is a different thing and not as easily organised.
As an aside, BS memberships like the above need to be done away with. We need to get back to a place where it isn't legit unless it's a season ticket or similar, and where we're incentivising people to support their local clubs as much as possible.
You've clearly stated and repeated a deluded fantasy that the Bears would never accept, and it's an insult to everybody's intelligence to pretend that that fantasy is even close to comparable to a full blown relocation like the Swans. You're also already accepting of a glorified FIFO East Coast club under your criteria.
If the Bear's gain a Perth license it'll happen in one of two ways; either the NRL will give them full ownership over a license to run an NRL side out of Perth. Or it'll effectively be another merger club where the Bears own the majority stake in partnership with a consortium from Perth, which will suffer from all the same power struggles and issues associated with mergers except the tug of war over control of the club will be between entities on opposite sides of the country. The prior would probably be better than the latter.