Sorry, I linked the wrong video:
[ Show youtube player ]
There are a couple of options listed by Jan, a resistor fix:
https://forum.amiga.org/index.php?topic=72859.0
Or a mosfet fix:
http://megaburken.net/~patrik/Amiga%...%20Fix/fix.txt
And lastly an adapter pcb:
https://rastport.com/products/KA47/
The floppy signal is listed as MTR0 on that page. Note that the gotek doesn't use the motor signal so you don't need to switch this over to the gotek you only need to disconnect it from the floppy drive when switched over