I only have to set up encryption on the wireless network if I use one of the company's machines to vpn in.
I'm curious as to why you need local wifi encryption to connect with a company PC - with an IPSec VPN you would have a secure tunnel from the NIC of the company PC to the company's VPN end point, without any need for wireless encryption.
With SSL you would be encrypting the contents of packets sent between you and the SSL host, without any need for wireless encryption.
SD