Well like you said, after a while it kinda becomes part of the routine. I carry a box with small drain pan(made from an old plastic oil bottle and a razor blade) and 12oz of oil to put in the bike and a bottle of the flush mixture as well.
BTW that MR12 race gas I mentioned needs to be flushed out as well, if that makes you feel any better lol.
I don't use top lube in my drag engine, the junior guys are kinda anti top lube, they say it causes fuel problems. I can say that I have not ever run top lube in my alcohol drag engine and have had zero problems. I think the reason is because it's strictly drag racing, I think if it was a different type of racing where you were in the throttle for longer periods of time, not running top lube could become a problem. Also your engine is pushrod type which I think needs top lube more than my flathead might. I was wondering if using M3 means you need top lube, I use M1 with no lube.
Guy I bought the motor from said I could run M5 and make more power, but would have to be tuned for it.
Basically once you get used to running alcohol and taking advantage of the higher performance and cool clean combustion and the great smell lol, the act of draining 12 oz of oil and draining a carb bowl with a screwdriver seems trivial.
That's just my opinion, but again my bike is drag only.