When you use an external coil and a battery to power it on a magneto (instead of the mags own internally generated energy), you're simply using the mags points as the coil current switch, so in theory you could use instead a solid state switching device. HOWEVER the typical coil distributor ignitions use a magnet placed on the distributor shaft and a pickup which tells the elec switch when to trigger so that may or may not be a mounting/installation problem (depends on the mag).
That being said, if I wanted to change from a magneto to a battery powered ignition, Id FIRST go ahead and switch to a regular IHC distributor. Then if you want to replace the points with an elec switch it may be easier PLUS as reported below, you will have an RPM based spark advance curve versus the mag which has only two timings, start and run.
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