Shimano removal tools start at £2.99 posted on
eBay (£1 posted if you don't mind waiting for it to come from China) and they are so useful that it really isn't worth not having one.
The Huret will cope with 28 teeth if you make sure the spring is in the 28T position, I only realised what that was for a couple of years ago, but the Suntour will work much better. I'd recommend picking up a pair of Suntour Power Shifters too, they a big improvement over pure friction shifters.
There might be a bit of money in the Regina freewheel if it's in good condition and you can get it off in one piece.