Buy Alpinestars and you don't need to break them in. They won't last that long though. As for your Gaerne things - don't wreck them by peeing, heating, crushing & greasing. If you do that all the tiny fibers in the stitching and leather etc are being stressed. A LOT.
Take the time to coat them with quality boot wax and walk about, ride a bit, walk a bit and ride a bit more. Keep waxing between seesions and you'll soon find their sorted without ageing them sooner than you need to.
You would'nt flog a brand new piston so why do it to boots! They need a warm up like the rest of us.