I did my FD bearing & seal before I left because it needed doing and had done for quite some time. The engine oil was also changed and I gave the bike a dose of looking at.
I am carrying a couple of coils sticks (I don't know how the second one got in there

), a couple of injectors, spark plugs, and an old alternator belt. I also have a puncture repair kit with compressor, and spare lamps & fuses along with the cable ties, rags and a few additional tools.
I DIDN'T take my old HES assy which was working at the time I replaced it when dealing with another problem.
If you have the space and carrying capacity I think it's worth taking some stuff because it can save you hours, or days, waiting somewhere and if you have a limited number of callouts on your breakdown cover you can save it for when you really need it.
Thankfully I can deal with most of my bike because I have been through most of it over the last couple of years except for the engine's internals. I have given it a hard time and have had to deal with the problems I have given it. I think I'll give it an easier time in future.