You can order good dirt bike bars in any configuration you want as far as rise,width and bend angle offset from companies like Pro-Taper.

I am currently working on a set of adjustable bars for the Suzuki, with infinitely variable 3 axis positioning within the parameters of the device. Fouling of the shroud is a major design obstacle on a sportsbike so the plan has changed 3 times. My design requires a clamp on the top of each fork to which the other components are fixed. They have been cut for me by a workshop from 25mm thick blocks of aluminium using a computer controlled high pressure water jet. The accuracy and finish are remarkable.

It’s a wonder the manufacturers don’t provide adjustable bars, seats and pegs across their ranges. There would be a much wider market, particularly for sportsbikes, if you could get comfortable on them. A Thai massage is needed after an hour in the sportsbike crouch.