Finally, after a while of trying, I have collected the impossible (possible) coin without using pannenkoek2012's method!
On a video he made about conserving sliding speed, he said that when he collected the impossible coin using conserved speed the speed he used was hacked in and wasn't sure that you could get enough speed to reach it but I managed to get more than enough speed to reach it!
What happened was that when i did a BLJ I clipped through the fountain and into the water inside and since your sliding speed doesn't update in water, I was able to conserve all that speed. Then I use that speed to get zoom towards the impossible coin! When I exit the water, I have to press Z on the frame I exit otherwise the speed will go away. I have to press Z to go into a slide so I can use the speed otherwise it won't do anything at all.
This is on the WII U if you want to know.
