getting the knob to look right is diffucult
Exactly. Based on my experience (hindsight is definitely 20/20), a universal fit can be made to look and feel (as in a thumbwheel that doesn't wobble) like the original if, 1) The adjustable holes for the mounting screws are properly aligned with those in the interior liner's trim -- which is not as cut & dried as one might think, and, 2) A conservative approach is used should the thumbwheel post on the replacement control need to be shortened. If it appears you'd have to make deeper notches in the end of the thumbwheel shaft as a result of your cut, you're removing too much from the post. I ended up with not enough thread in the post for the screw that secures the thumbwheel.
I got tired of looking at the empty egg shelf on my fridge. Only once have I had to use that space for something due to lack of room. I now have an installation of a dozen multi-colored plastic Easter eggs in there indefinitely.
That Hotpoint sounds nice. Post pix if you get it.