@JoeyBob -- does anyone know if the router allows for downloading open-source router firmware like OpenWrt that support such functionality?
Since the Shaw boxes are a combination of a "modem" (modulator-demodulator) and a "router", I would very-much doubt that there is any alternative firmware that emulates both functions of the Shaw boxes. Note that software like OPENWRT receives Ethernet traffic, and distributes that traffic; the third-party routers compatible with OPENWRT lack that "modem" functionality.
I doubt that the Shaw Network Engineers would allow you to connect a "non-Shaw" modem to their network.
How are you measuring "buffer bloat" and how does it affect you?
Have you tried "bridging" the Shaw modem, and using one of these routers:
https://www.snbforums.com/threads/list-of-smart-queue-management-sqm-routers.47183/
that do support SQM ?