Looking for a reading stand like this

Book Stand

or preferably

this product

probably too much to ask for with the second one but products similar to the first must be available somewhere.

I wonder how hard it would to make something like the second one?

Did you try B2S?

or Asia Books?

or Kinokuniya?

or any of the multitude of Thai book stores?

or any of the street/independent bookshops?

No point in trying to help you out by visiting any of these places if you already tried there... but you don't say if you did or not.

B2S is the most likely place to have "accessories" like your items.