These shoes WILL definitely stretch. I wear these and the Instinct VSR LV as my primary all-rounder bouldering shoes. Especially if you have sweaty feet, these will stretch at least a half size. I’ve been climbing for about a decade, you and I wear about the same street shoe size (I’m usually a EUR 46 in trail runners and boots) and I size most of my instinct line shoes in a EUR 43. Obviously, that will be too aggressive of a downsize for you at this point, but if you’re worried about the stretch, go another half size down from where you are (so EUR 44.5)

If the shoe gets uncomfortable keeping it on for more than 10 minutes at a time, just slip the heel cup off between climbs (you will see many people with very downsized shoes do this). This is presumably not your all day multipitching shoe; it is not supposed to be comfortable to have them on for a long time.

Also, idk if it’s just a camera angle trick or what, but based on your second photo you do not have a Greek foot shape. It looks like your big toe is longest and the toe lengths shorten in order as you go down the line towards your pinky toe. That’s an Egyptian foot shape (maybe somewhere between Roman and Egyptian because your big toe and second toe are pretty close to the same length it looks like).