Those older units only support a few frequency bands. I know the 5510L, newer than your devices, I replaced with a 7730L had only a few bands (LTE 700/1700; CDMA 800/1900), while the 7730L had many more and included GSM/HSPA (LTE 700/850/1700/1800/1900/2600/AWS-3, HSPA 850/900/1900/2100,CDMA 800/1900), so it worked in Canada. (https://www.comparecellular.com/mobile-internet/novatel-mifi-7730l-mobile-hotspot/specifications.asp for specs).
Thinking about this a little more, If you still want to pursue using your existing Sim I would imagine that you would need to remove it from your BR-1 and put it back into whatever device Verizon originally provided. Once it's back in the original modem use VZ Access Manager to update the modem/Sim.
Once that device updates correctly you may be able to move the Sim back into the BR-1 and have it work.
Depending on where you buy new tires, you may find that you can get a significant "trade in" credit for your current tires. On two occasions I have purchased tires at TA and was pleasantly surprised at what I got for my old tires. The first tire shop I checked wanted $20 each to dispose of my old tires. I then went to a TA (Truckstops of America or Petro) and they offered me about $100 each for my used tires with good tread after we had agreed on the cost of a new tire and install. TA will resell the good used tires as trailer tires.
I have a Peplink BR-1 Cellular Mobile Router that I put a Verizon Sim card into, but that sim card originally came in a Verizon supplied device. I wouldn't expect them (Verizon) to support the use of their sim card in (or even know the specifics of) a Third-party modem/router.
Hopefully when they send you a new device you'll be able to transfer the sim card, but I would check with Peplink to see if their software will support it.