I can give some insight here, basically the answer is no. Vumatel has the ability to do this but wont deal with end users directly. Also their consumer lines currently are limited to 1000/100 (1Gbps Down, 100Mbps Up) so the most you could get from a tunnel or capacity perspective is 100Mbps.
Any ISP can probably do this but the setup is a bit complicated due to the nature of the Vumatel system, but essentially we would need to assign a non public routeable IP range to your home (and then just charge a "Line" fee), you would then still need to IP tunnel to your Internet service at the office. To do all of this is quite a workaround and is quite a thing for your ISP which generally doesn't make it feasible to support

.
That being said if you had a home and business account with us we would probably try and make a plan.