Ron,
Kennedy talks about the use of a VW diesel starter. This picture is a one I found on eBay that looks as though the solenoid is clocked such that it might work.
They do say that they put a custom housing on it, but it may be worth investigating.
Don't think the Kennedy hi torque starter, even though clockable, will work. I'll post a pic tomorrow in evidence of this. (I'm on my wife's laptop as I watch LeMans downstairs.)
Lynn