As an alternative to using VM to link the phone sockets to the hub, you could see if you could find a reliable and reputable local installer to do the work since this type of work is not being done by VM at present. Most areas have local independent telecoms/data cabling engineers etc. who should be able to do that kind of work.
As an aside, are you aware that if there is a power outage, or the VM hub is offline for any other reason, then your VM landline phone function will also stop working which in turn means your alarm would not be able to dial out on the VM landline. Alarm companies usually now offer some kind of mobile/SIM dial-out connection powered from the alarm battery to get around this problem.