Sorry about the mix up with your account but thankfully you are here now.
With regards to the grab rail you are right, they are very rare. I don’t have any spare ones at the moment but I do have a potential order with a friend of mine who imports from the USA. We are also in the process of having Stainless Steel ones done as well. I will update as things progress.
Sadly the grab rail is unique to our twins and as far as I am aware no others will fit.
I can get seat straps if you want one.