I'd check the charging system output at different RPMs and make sure that it is working well. If not, *usually* it is something relatively cheap like brushes, voltage regulator, or diode board, And sometimes it is the alternator which is more money. If I didn't have alot of cash and wasn't looking to run more electrical accessories, I wouldn't replace the alternator until it needed it. It wouldn't hurt to replace the brushes (they are) and that could be cheap insurance against stranding on the roadside.
The aftermarket diode board from motorrad elektrik is a good one and, it could be considered somewhat of an insurance investment as the old diode boards do eventually go - and some sooner than others due to soldering issues. If your existing diode board is still doing its thing properly, you can choose whether or not to update it now. I did mine just as a matter of course when I was updating other things on my bike. The voltage regulators do also die, suddenly, when they do, and that can leave you with dead battery even with everything else working. Motorrad Elektrik also has some solid state voltage regulators that aren't expensive.
Some folks (and it often, but not always includes me) are of the "if it ain't broke, don't fix it" philosophy. But, if it is a big x-country ride in the future, I do try to either update, or at least have a handy spare for some things such as a throttle cable, diode board, voltage regulator, relay, and maybe a clutch cable and some fuzes tucked away somewhere.
