VPN endpoint without endpoint router?

Hi All,
If I've got a home network using a non-vpn-endpoint router like a BT
home hub, is it possible to add vpn-endpoint functionality in hardware?
Scenario: user has bt home hub, and are unwilling to swap it out for a
replacement router that adds endpoint functionality (which would be my
favoured option) as they'd lose all the BT home hub IP tv
functionality.
they want to be able to vpn into their network, preferably in hardware
rather than using a PC left on continually. is it possible to add
another network device (a cable router with endpoint option?) that
will give vpn endpoint functionality, and either thru port forwarding
or use of a DMZ send traffic coming in via the home hub to that device.
is what i'm after a vpn concentrator?

cheers
ric