QuiltingVagabond

I bet it would work but you don't want to spend the money to experiment. The newer Sweet 16s do not need the conversion foot thing, all the feet fit without it so yours probably doesn't need it either. Check locally for a Sweet 16 owner to borrow one of their feet to try?

Edit to add: I have the Sweet 16 but not the Sure Foot and use the regular foot for ruler work all the time. The Sure Foot is just a tad bit taller to give the ruler a better edge to guide the ruler but is not an absolute necessity.