It's not very easy to get EDIS to work with a cam trigger unless you have a very large trigger wheel. But it's possible to make Megasquirt (or quite a few other aftermarket ECUs) run a distributorless ignition with a suitable cam trigger. The simplest cam trigger I've seen appears on a few Mazdas (including the Miata) and Mitsubishis - it has four outer holes and either one or two inner holes, and two optical sensors. Each outer hole triggers an ignition, and the inner holes reset the ECU's count.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair