Can the AEBS untag a VLAN (802.1q) on the WAN port?

My modem (actually a fibre optical network terminal) provides a DHCP ethernet port. I would like to use my airport extreme for routing and wireless. Normally this would be a very simple setup, except the the modem requires all traffic to go over a specific VLAN (802.1q tagged). So, for this to work I would need the Airport to be able to untag/tag a specific VLAN on its WAN port. Is this possible?

I'll probably try to find the most minimal device that I can get to do transparent untagging of VLAN traffic. Not really sure where I might find that, but will start researching. I'd like to avoid using the current buggy router supplied by my ISP if at all possible!
I would suggest that you look at the various products provided by Cisco. FWIW I use a Cisco RVS4000 as my "main" router and have set up a number of VLANs for my home network with it.

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