Hi how about trying a ride with your visor in a different position just in case it has developed a whistle....sounds can be very deceptive little buggers..good luck
Including the OEM, I am on the third set in the rear wheel. So far I have gotten about 20K miles on each set. The current set has about 23k miles and so far so good. Fingers crossed.
I guess some of us are trying to problem solve based on your saying "screech," thus wheel bearing which it doesn't sound like you've ruled out (see @warp9.9 suggestion), but your first description says "buzzing." For an earlier discussion on that search Increasing louder "buzzing" sound in front end. 15 R3T?
Yes Warp is just checking wheel bearings he believes the torqie is a might much but since it is new and we all know how triumph assemblies are are perfect and there is no reason to think the torque is wrong whether to little or to much
Process of elimination. Like checking the runout of things that should run fairly true. Disc fir instance even though they float they can be checked as well as the base of the disc which does float. ABS rings all kinds if things. I like your idea on the gauges. And you should check all shields on the exhaust and the radiator shrouds. Loose screws are comon on new bikes no matter what year. Check you ckutch free play 2 to 3 mm at the lever a dead mans clutch could be spinning the pressure plate bearing and that might be loud at higher rpms. Ive seen guys complain about the noise at idle. Of course if you trust the dealer it is under warrantee.
Dealers handy work? Took my bike into a dealership one time to have the back tire replaced. Got home and found that the passenger pegs were installed wrong. Folding up in wrong direction. Fixed it. Then when it came around time for a new tire found that they had torqued the axle down to the point of being ridiculous. Had to replace wheel bearings,spacers and several stripped out bolts including the bolts that hold the foot peg rails in place. Had to drill the little guys out. Called the dealership up and explained to them what i had found and required replacement. They told me the guy who that had worked on the bike had been fired. No hope in getting reimbursed for parts. Took a ride out to Oklahoma city a few days later and guess who was still working there? Have not been back to a dealership since then. With a lot of reading and the help on here really can get by doing my own work. A lot less headaches.