I hear what you’re saying, although in my experience its unlikely that the headstock bearings and wheel bearings would fail at the the same time. I’m not saying they hadn’t and that’s the last thing you want to hear here. I am saying these things cannot be properly diagnosed from riding alone, they should have been tested and proven to have failed before jumping in and having them replaced. For example, headstock bearings can be adjusted to eliminate play and similar poor handling symptoms can be experienced and caused by other failings such as the fork bushes etc.
It’s very true that green laning will cause more wear and tear to the likes of the headstock bearings, wheel bearings and the suspension than normal road use would and it’s wise to keep an eye on these things. However, for the future my advice would be to have more faith in the annual MOT inspection where all the things you mention and then some are rigorously tested and those tests are carried out with the construction and use of the motorcycle in mind. With the MOT being just around the corner it may have been a better idea to have just booked it in for an early MOT and acted on any failings and advisories accordingly. Did you know you can get a 13 month MOT by booking the test one month before it’s due?
Idling at 1,650 RPM is not goode and will cause premature wear to the clutch, brakes, piston rings, cylinder bores, valve gear, spark plugs etc. It can also be an accident waiting to happen if your hand slips off the clutch or your foot slips off the off the brake when opening or closing the throttle. Why would you want any of that?
Headlamp main beam failure - The most common causes are bulb filament failure, fuse failure, dirty or corroded connections, there’s little more to it than that. Repeat bulb filament failures are most likely caused by bulb vibrations due to a worn bulb holder clip or an incorrectly fitted bulb.
HTH and stop playing the girlie card when it comes to things of a mechanical nature.