Question about Ubiquiti UniFi Dream Machine - Special Edition

I am looking for a "real" multi-WAN router with channel bundling (i.e. not just load balancing or fail-safe). Viprinet routers are supposed to be able to bundle multiple connections, but I can't find them in Switzerland. I would like to bundle existing, weak Swisscom and Sunrise connections at one location for more bandwidth. If possible, also via an existing Mobile Data contract via the mobile phone network. - I would be glad to receive hints and suggestions, thank you very much.