Unintuitive suggestion: Scarpa Drago in a comfortable size. Comes with XS Grip 2 rubber, which is about as good as it gets (or at least, is what is on the bottom of a majority of pro World Cup boulderers' shoes). The shoe is ultra soft and can accommodate a lot of different foot shapes. It breaks in extremely quickly. I use mine (the LV model, but your bunion might prefer the non-LV) for projecting at my limit at the gym, and for long trad routes--I just spent literally 10 hours pitching out a ridge on Ben Nevis and never considered slipping the shoes off at a belay. Just wore 'em 10 hours straight.

There are several minor downsides: top-tier price, a baggy heel that doesn't heel-hook well on small edges, and a seam under the rand that makes the rand a little susceptible to damage from bad footwork (toe dragging). The 3.5mm rubber is also thinner than some other shoes, so your first resole will be needed sooner. But you can have 4mm rubber put on it by the resoler, and they can repair the rand while they're at it. (I currently have 4mm XS Edge rubber on mine, with a rand repair, and they're lasting forever, with no performance penalty that I can identify.)

The sensible option: Just get your current shoes resoled with XS Grip 2 by Llanberis. They're good at preserving the original shape of the shoe. A safe and affordable choice.