Yeah Andy know exactly what you mean. Here’s what I learned. Don’t do their checklist. Just learn the basics to start the plane itself and keep any external switches you have in the ON position. For example on a Cessna 152, turn on battery/Avionics, open fuel valve on floor, prime a couple times, set air mixture to 100%, set throttle to 5%, then turn key to start.
For the A320, it’s only 7 or 8 basic steps to go from CnD to a plane ready to take off.
Good luck!