I think I found another route that would be good.
US 31 to Muskegon, I 96 to Grand Rapids, US 131 south to I 94. Head on over to I 69 south, turning into I 469 and onto US 30. Follow that to 309 and then get busy at the Rallye.
I figure a good 6 hour ride. Won't even get the bike warmed up.