My slant needle singer 301A, free motion foot came from a local sewing machine and vaccume(ugh)cleaner shop, it is made of lucite and is easy to see thru and around when FMQ.....i would think the knee pedal would be great to control and you could even put a block behind it so full bore would be the right speed
the only tips are be sure the presser foot lever is down, bring the bobbin thread to the top, sink the needle into the correct spot for the first stitch and hold onto the threads for the first few stitches.
Be sure you follow the instructions for lowering the feed dogs and setting the stitch length at neutral(half way between forward and reverse) :D :D :D :D :D