I wanna build a habitable desertworld which is a gas giant moon. The desired and already semi-fixed parameters are:
mass between 0.4 and 0.25 Earth-masses
only 10 to 30 percent global ocean cover, water is mostly near the poles
orbits a 13,1 jupiter-mass warm superjovian
extensive vulcanism and some plate tectonics
global average temperature between 40 C and 45 C, just shy of a runaway greenhouse effect
only one atmospheric circulation cell due to slow rotation (the moon is tidally locked)
sun is an old F-type with only a few hundred million years left on the main sequence
For story purposes I want the poles to be separated by a huge, scorching, equatorial desert. I don't want any rainforest or even savanna near the equator. Hot-semi arid (Koepen climate class BSh) bands on the equator would be the most I'd be willing to accept, oasis of it would even be welcome.
Will my setup already deliver what I want? If not, what could I tweak?