No matter the scheme, one must to retard timing to start engine.

Lawn mower engines, etc, that use an "electronic module" in place of
points and condenser, advance timing auto-magically.

These "electronic modules" are cleverly simple, but require a carefully
designed permanent magnet and magnetic circuit.

(rate of rise of generated voltage is quicker at higher RPM's, thus
advancing the timing of spark)

One can eliminate the "electronic module", by making a simple permanent
magnet high voltage generator, but you will not be able to precisely
time the initial spark.

This latter approach is what I've been thinking about for a direct
injection approach.  (Wherein all one needs is a source of ignition,
that is present at the start of injection.)

JCP


Aircraft engines don't retard the timing to start the engine.
The prop is a large flywheel.

Paul Lamar