It must be different in each province. I used to work in centres and while all our rooms USUALLY had 2 staff, there were times when it was just one. Most of us stayed in or just went to one of our 2 side playgrounds as it was only a short walk outside of protected walls and gates lol. There was one staff who would take her kids on walks, they were 4-5 yo though and listened very very well to her. When I used to do the school age centre I'd have 8-10 kids and walk about 5 blocks with them to the centre. For us, it was one of those things that was legally allowed but not in "best practices". Best practices came into effect shortly before I left so I don't remember all those rules as well.

As for the OP, I agree with the walking rope. Have the "runners" close to you and if possible, hanging onto your hand. It will take time, patience, firmness, consistency and many reminders but you will get there!! This is why I think walking with small ones is so important from an early age, even if it's just a block or 2 in the beginning until they learn the rules. They can't just be expected to know how to "walk nice" if they go directly from stroller to walking.

Good luck!!