Using moca adapters

The coax port on the T3200 is for a LAN connection. When you have the ONT connected to the coax on the T3200, it acts as a glorified switch and may actively fight the ONT/Telus for DHCP. You would want to avoid that as it'll just cause problems. The 68.x IP address is an external one and normally accounts are only permitted 2 IPs. How often that's enforced, I do not know. That would mean your devices are wide open to the internet with no firewall. That's what happens when a WAN connection is connected to LAN instead.

There is a good possibility that the coax jack in the bedroom is not connected and that Telus has isolated the existing coax line being used. If it is isolated and the rest of the coax lines are all on one splitter, you'd actually need a second coax jack to connect the T3200 itself to, and then have that jack/outlet/cable connected to the coax splitter, before the upstairs one would see a signal. That's assuming the splitter is still connected to all of the other outlets. Depending on the age of the house there may be more than one splitter. My parent's house had the splitters inside the house and not in the outside box. Means Shaw didn't have to drill as big of a hole in the house to run the lines in.

If that splitter was still connected, in the Shaw box (Telus boxes don't have coax typically) or elsewhere in the house, and the rest of the coax outlets were all on that same splitter, none of the other connected MoCA adapters would be part of the network created by the T3200. They would be pulling an external IP from the ONT, if they're able to, and you'd need another router for each MoCA adapter. It gets expensive and complex doing it that way.

The next best solution I would suggest looking at, if you are looking for a hardwired connection, may be powerline adapters. There are gigabit ones available so they wouldn't limit the speed and often can be placed anywhere as long as they're directly plugged in to the wall. If you do that route, I'd recommend reading up on each so you get the right set.