Ok, I'll try to do both in this week-end.. 
Next weeks I'll be practically offline due to exams...
For what concern the xDSL part, this modem (but also vr2600 and few other) could be "supported" in theory, because of the two cpus... for example I can restart the QCA9550 while the broadcom is still alive and working...
We should "just" find the way the two cpus send commands to the other. Unfortunately I don't have an adsl line anymore... so I can't test it... but I'll inform you about my findings 