For decades automotive manufacturers have used batch firing for fuel injection, all 4 on one side then all 4 on the other side or 3 then 3 etc. The actual timing of the injector spray has little effect on overall performance.
True sequential fuel injection systems are much more complicted in design and cost.
Larger injectors, higher pressure fuel pumps, more sensors etc to deliver the required amount of fuel in milliseconds vs batch firing being able to cycle twice per combustion event.
Regarding your thoughts on the intake ports; even with no divider in the intake between two adjacent cylinders, the intake valves are not open at the same time on the adjacent cylinders so competition between them is measurable but negligible in most cases.
Timing of the injector spray is only relative to the fuel being there at the start of the intake stroke.
The ignition system decides when to fire the spark plug to ignite the mix approx 360 degree later.
If you want to try this just to say you did it then all the power to you, I enjoy reinventing the wheel on occasion myself. From a practical functional standpoint I think it would be too much work for too little gain.
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