Mohs surgery is procedure named for Dr. Frederick Mohs, who developed this skin cancer removal technique while he was a medical student. Mohs surgery involves removal of a skin cancer by checking microscopic margins to assure complete removal of the tumor while limiting the amount of normal tissue removed. It is commonly used for skin cancers of the nose, eyelid, lip, ear......places where you want to remove the smallest amount of tissue possible and still remove the whole tumor. Once Mohs surgery is performed, the resultant defect (hole) is repaired, usually with a skin graft, skin flap, or sometimes it heals the best without any repair at all.
Your photos show that the surgeon used a skin flap to repair the defect left in your nose after the skin cancer removal. This flap has caused elevation of the tissue in one area causing a bump, and a depression above the bump where there is scar.
It doesn't make any sense to me for you to have a rhinoplasty, since there has been no nasal bone or cartilaginous change to your nose, you just have a soft tissue problem. It also seems overly aggressive to have a "muscle from your scalp" placed. With the large defect you have, I think it would not be advisable to use filler as a first option.
Although it is hard to tell for sure without examining you, my inclination would be to work on the soft tissue scar, since you were happy with your nose before the Mohs surgery. The flap could be thinned surgically under local anesthesia, possibly steroid injected, and if there was still a deformity superiorly, maybe a little filler could even things out. I agree with your feelings that something "less drastic" should be done.