As-salam aleikum wa rahmatullah,
I'm happy to see a brother who have a courage and creative mind to interpret Isaiah 53 as refering to Prophet Muhammad (?). And yes, based on my analysis I can confirm that Isaiah 53 is indeed, paradoxically, about Rasulullah (?), not Jesus (AS). After I finish Isaiah 29:12 (God willing), I will show insha'Allah in few points how Isaiah 53 actually depicts Prophet Muhammad (?), and especially one detail alludes to him in a truly spectacular way.
Take care,
Idris (Ahmed)