I believe it's possible as you describe and I should be able to confirm within a week to ten days. I'm waiting for a new FTTC installation and haven't been given the date by the customer yet.
Depending on which firmware you use, VLANs can introduce odd behaviours and some features may stop working completely. I have 2860s in use at three sites and the older factory firmware wasn't good when VLANs were used.
If you run firmware 126.96.36.199 (build date 15 Sep 2014) with VLANS, DHCP only works on the first VLAN. I haven't yet upgraded to newer published firmware or the beta firmware I use at other sites to overcome ARP problems.
I will be setting up scheduled access on the new connection so shall let you know how it goes.