I had a look at your untested #4 solution last night. In the write up I assume a typo "The OR-Pin30 is NC when not energised" This should read NO as 87 & 30 closes when relay operates.
The diagram you used for the delay relay is most likely not the same as the normal 12 VDC relay pin layout. I am assuming that the Orange wire shown to pin 87a is the +12 V positive "Supply voltage" and the Yellow/Green from the solenoid/starter switch is the "Trigger". The delay relay must "latch" to keep OR operated when the motor is running. Not sure if such a delay relay can stay operated indefinitely.
The first problem that may crop up is that you are operating 2 relays in series, thus halving the current through each. Some relays may not like this. That is assuming the delay relay has the same standard coil as the OR relay with no other components built into its path to the trigger. If this is in fact a solid state delay relay the chances are good that you have components on those leads and may not get good current flow to operate OR in that way. The other issue is that the a false trigger (Positive) via OR coil and D1 may start up the timer before the starter button is pressed
Then the second or third start. After the first start the engine dies, then the circuit must go back to its first state to allow the exact same process for the next starting attempts. If this is not done, only the first start has the timing delay.
Good luck with locating workable relays.
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