Triple bypass off pump EF of 35%. Also a 6cm + aortic aneurysm

My husband is scheduled to have a triple bypass on August 24 2024. He has heart failure is EF was 15% had improved to 45% now is 35%. The surgeon said he cannot put him on the pump because it would cause too much stress on the aneurysm. My husband is 75 yrs. old. He was scheduled to have the aneurysm removed but test results for that surgery showed his right artery was 100% blocked and left 75% at the head of the artery. Not sure about the other one. So worried about the aneurysm leaking during surgery. Can't do both at same time the risk very high. Anyone who could add some insight on this would be much appreciated.