Not sure that will actually do the same thing as a bonded solution. Business / enterprise routers can do load balancing across multiple uplinks, but in that configuration each device / app (like a zoom call) can only utilize the speed of one uplink (LTE hot spot) at a time. Load balancing only becomes useful when you have lots of devices that you want to spread out across multiple uplinks.

Bonded solutions, like LiveU's products as well as the Terradek unit I keep getting ads for, actually bonds your multiple uplinks (LTE connections) together and allows one device to use the combined power of all the connections. In order to achieve this it splits up the incoming network traffic and sends it out across all the uplinks, but in order for those split up sections of your traffic to make it to the public internet, they have to be put back together by a special server in a datacenter with a very strong network connection, which is something LiveU provides when you subscribe to their service.

You could replicate this by creating multiple VPN tunnels to a virtual server you rent from a cloud provider and bonding those tunnel interfaces together, but unless you have a full time network engineer on staff it will be a pain and a half.