Track days on a big modern 4 stroke. Decent set of tyres, tyre gauge and pack your talent. Jerry can full of E5 as circuit fuel can be a bit pricey/stale. Proper food/water and a chair
Once you are outriding the standard bike, your sticky tyres and can outride the electronics, you can move on to improving the bike and probably get a contract riding in BSB.
My R1 & HP4 I don't even take the mirrors, indicators or number plate off. Makes for good Gppro mounting points.
But does it matter?...........I've seen guys on ?50k plus bikes riding in novice and inters - each to their own imho. There's no "right" or "wrong" way to do track days and sometimes people change things to make a bike nicer / easier / safer to ride rather than purely to go faster.