My sight was supposedly left-handed, but it was just a right-handed sight that I had to dismantle, flip over and rearrange it so I could use it. I'm probably not using it the correct way, but it works for me.
Meanwhile, I found
this scope from Archery World in Preston (the first item), which looks versatile.
I don't know if it's what you're looking for, but maybe it's something that might work for you.