I have custom moulded Sidas insoles. Got my first set done in 2013, best money I ever spent on cycling, had them in all my shoes since. In UK at least a lot of bike fitters and good LBS have the equipment to do the moulding, I’ve had sets done in 3 different places.
I have feet where one is a size bigger than the other, both wide at the front, relatively narrow at the heel, very high arches. Finding a shoe that fits well off the shelf with good support and no hot spots is basically impossible!