I wouldn't want shiryu either. He's strong and all but Mihawk look's more unique, especially after the resend events in wano. Zoro having CoC/ adv CoC and the black blade conversation were all things that hyped Mihawk as well but i just can't see them fight.
I hope God hears your prayers brother.
Like Brook said in thriller bark, fights between 2 users of destruction don't last very long.
I could even see it ending in 1 standoff and them using their strongest attack from the get go to decide the victor then and there.
(also cutting the island they are on in half in the process)