Two factor at multiple remote properties, no cell

I have two rural properties neither of which have cell service. I have Telus-supplied copper wire landlines at both. Telus Fiber is not available at either location. I have Xplore satellite telecommunication services at each location for Internet and email. I need a single phone number for both locations that I can use for two-factor authentication. Xplore has its own VoIP phones which allow voice-based 2FA codes but not SMS. I have a basic flip phone and I purchase a yearly prepaid plan called Text and Talk 100 from Telus. In a year, I've never used up all my allotted "free" voice and text. I top up for long distance to the tune of about $35/year. It would be nice to just use wifi calling from my cheap flip phone using my existing prepaid plan. After looking into it as a possible option I found that I would need to buy a newer phone that supports VoLTE and wifi calling and probably a plan that would make my prepaid plan look cheap. What are my options to get talk and text at the two rural locations?