Mihawk is not positioned somewhere in the story to do that imo.
First he is always in vicinity of CG, so let play that scenario through:
If crackergoku appears at CG, there needs to be a scenario where there would be even a 1vs1, very unlikely not only because of logistics but also how oda draws such battles, see gv currently.
Than oda also would need to let Bumgoku negdiffed. Which is not impossible but given that he would even not let even shiki or WB neg another named character we will never see in GV ever? Eh
For fuji i see 0 chanche
So can it happen? Sure
Is it likely? Not really