Yeah, that's a no-go on the modem replacement. I asked if I could get my own personal modem (like I do for cable companies) and they would not allow it. However, the VPN is an option and I already have a fortigate 60D with VPN option. Think i will toss a public ip on that and see if the VPN works.
By the time this is figured out, FGU will be released and wont be an issue anyways? At least I hope. If not the 60D might be the solution I need and already have that I can use. I will report back my findings when I am done with my testing.