For example, an ISP offers public IPv4 on one APN and IPv6 on a different APN, while I want both at the same time. I did a similar thing before with two PPPoE clients on a single wired connection to get both IPv4 and IPv6, but I don’t know if it’s possible with APN profiles as well or not.
The hardware I’m planning to use would be R11eL-EC200A-EU, a USB adapter for WWAN cards and RB5009.
Update: According to the manual, something like this seems to be possible, but I haven’t managed to get it to work yet. Also, my plans changed a bit, I now have an SXT LTE6 Kit for the RB5009 and I’m planning to use the R11eL-EC200A-EU with a hAP ac2.