If you have different size feet, and struggle to make a single pair of climbing shoes work, buying and selling single shoes is the best way to get shoes that fit cost effectively.
Trying to determine if there is interest in a marketplace and community of climbers with different size feet. We will never use this information for any other purposes or spam you messages you don't want.
If there's enough interest, the idea is to introduce people who have complementary foot sizes to be able to swap a shoe that is too big or small for them. You could also buy and sell single shoes, similar to facebook marketplace.
Generally no, Most climbing shoe companies do not offer this.
Except for Unparallel. As of 2022 they filled orders for split size climbing shoes with this form. Give Unparallel a look if you have different sized feet.