Although not really a optimum configuration is to attempt to use your PC as the hotspot. You have to be careful about running intensive programs on the pc because it may disrupt the devices using it as a hotspot.
If you go to microsoft site you will find a setup guide for ICS. You can also search the many post of how to use a pc as a hotspot. You have 2 options. You can use your router as a AP connected to your pc ethernet or you can use a wifi card in your pc.
The only thing I can't say for sure is if the driver for the tethering has the needed setting to allow it to use ICS. Lately more do but there are still some that do not work with ICS.
The cheapest way to teather if it is on the supported list is to use dd-wrt. I...