I had to be careful to initially present very small portions. Otherwise my husband became overwhelmed and would be reluctant to even try the food. It's hard to remember, as he eats quite normally now, but he started with only a shot glass of soup or pudding at a time. His PEG was not removed until he could eat enough to maintain his weight.

It's a very complex process both physically and mentally and takes a long time. Some trial and error is involved and to some extent the patient has to be motivated enough to deal with the bad taste/smell/feel. Your father's acute sense of smell does sound extreme. I wish I had some suggestions for that.