Jim:
It looks like you have and IP 35, is that tight? If so, I know of an IP 35 owner that has a Tides Strong Track for sale that you can add to your mast and make the full battened sail slide even better. And yes, I think you can simply take off the furling main sail and go with a regular main sail. Here is a link to the strong track system, if you want this, I can connect you with the owner.
www.tidesmarine.com/sailtrack
Hayden