I recall reading this an old phrase, not sure from where, "There is nothing more permanent than a good temporary repair."
So the idea from Paul to use a specific color of zip tie is a good one to keep track of those temporary repairs.
My first rule of field maintenance is; "Don't take anything apart unless you are certain you have what is necessary to reassemble it." That could include any of the following; lockwire, cotter pins (for wheel nuts), torque wrenches, special sockets or wrenches, gaskets, etc... If you are on your own then you had best be prepared, if you are at a field with an FBO then you have resources available.
I remember an article in Sport Aviation a while ago where a bunch of guys took two Beavers on floats on a tour of the Arctic coast of Canada. It's a remote and beautiful place, emphasis on the remote. The article mentioned that they looked back in the logbooks to determine what items failed most or where repaired most often and the interval, this provided info on what was likely to happen in the flying hours expected during the trip. It also informed them of what to take for spares and tools to install those spares. Easier on a certified plane as everything is logged, but what does the history of your plane say?
Perhaps some of the adventurous Caribbean RV pilots can chime in on what they have experienced in terms of failures and fixes?
Your list is pretty good in terms of common failures and fixes, I would add tools and parts to repair a broken or chafed wire. It's a common problem on the Experimental planes I've seen as well as certified spam cans. Two major examples are if the alternator field wire fails you loose the alternator, if a magneto P-lead fails you have a live mag and a "hot prop", both good things to be able to fix.
So in terms of tasks, taking the cowl off and being able to reinstall it is number one, taking fairings or wheel pants off is probably number two in terms of likely-hood. Add some spare hardware to your kit, in case you lose or damage any of the fasteners for those jobs.
I know some pilots that carry a spare tube in case they get a flat, thinking of tasks, do you have the tools and parts to remove a wheel and brake, breakdown, reassemble, inflate, reinstall a wheel and brake, and secure a main wheel? Carrying a tube is good but it's only part of the job.
My two cents or so, it loses something with the lousy exchange rate these days.
Phil