In Dilemma of surgery decision. Please Help

Last year April, 2024 I did both chemoradiotherapy for 6wks and 4Rds of preventive chemotherapy to shrink a tumour very close to my anus so surgery was ruled out. Now it has shrink to nearly a complete response but surgeon still wants to give me a permanent stoma because there's a tiny residue left behind even though the biopsy from it confirm No cancer cells but surgeon still wants to do surgery because he thinks cancer might lying deep underneath the scar tissue. Both Mri and CT scans show no cancer so I am worried because I want to follow the Wait and Watch procedure but surgeon thinks cancer will come back so surgery is needed but what if I do surgery and biopsy confirms No cancer again 😢? That means I will have to live a stoma for no reason. And for clarification I am not worried about the stoma. Any Help from people with this experience will be deeply appreciated. TIA.