I did ask kancho to show me how to do the technique correctly last year. I told him my sensei experienced the same technique from kancho some decades back and I wanted to experience the same.
My sensei said when Kancho did it to him, he flipped over on the same spot without feeling any pain. He did this several times. And in no way was it a joint lock throw he emphasised.
When kancho did it to me though, he basically utilised enshin from the forearm all the way until my shoulder and the fulcrum is that shoulder not the elbow lock, thus when being thrown imagine yonkyo...
In the end I didn't fall in the same spot and I did feel all of the technique. He must have let me off since I probably don't have the ukemi skills of sensei.
Anyway, the fact that you want to post with your lead foot is irrelevant when your face is going to be planted on the mat. That being said, if the fulcrum is still the elbow, yes your are likely to be able to stop it. I wouldn't but you could.
Did you feel pain? I understand using it as a fulcrum from the shoulder which is how I did it for many years but to drive the shoulder forward and down, I felt the forward force and was projected forward but I could still remain on my two feet. My whole upper body is already brought down to an almost horizontal line which shows that my balance has been broken but the posting prevented me from having my face planted on the mat and still remain on my two feet.
Is udekimenage is in effect a pain and break compliance technique? In the sense that if you resist, you're going to get your arm broken therefore you better roll. Thing is I think that even if I don't resist the technique and go with the throw, I can still get away on my two feet.
Where is your dojo in Malaysia? Maybe I should pop by and see how it is done (please don't break my arm).