I think it can be done.
Back when we were all on 512 and AOL were saying they did not support networking some people took that to mean you could not connect to AOL using a router. It did not mean that really. What that really meant was that you could not go to them for help. And that's the message you are getting.
Even now they only "support" XP on networking and I've used WinMe since it was launched. These AOL help-people are not very techy. They work to set scripts and their information base is rather restricted. I like AOL, used it for over four years but you would not let one of their people loose with your mouse, never mind your machine.
I've had three machines connecting via AOL for a long time time now, albeit wired, and it cannot make any difference what speed range you are on. A router is a router is a router.
All you need to do is to discover your TCP/IP addresses etc, and set up your machine and router accordingly in the normal way. There's no big trick or secret to doing this. Just go ahead as you normally would for any ISP. The ISP is irrelevent to the exercise.
Hope this helps.