Deontay Wilder -- I'll Train Clippers Equipment Guy ... Let's Fight Back!

Heavyweight boxing champ Deontay Wilder says he believes in FAIR FIGHTS -- which is why he's offered to train the Clippers' equipment guy to fight back against Blake Griffin.

Wilder -- who's 36-0 -- says he wants to personally work with Matias Testi so he can face Griffin man-to-man and "settle this like we used to do back in the day."

Long story short ... Wilder doesn't think Testi had a real shot during the tussle in Toronto since Blake is a world class athlete and MT isn't.

But Wilder is confident he can be the Mickey to Matias' Rocky -- and have him eating lightning and crapping thunder in no time.