Handy - it seems like your route for replacing the door from a supplier is now limited.
From your handle, I assume you are capable of turning your hand to such things. Making kitchen doors is not difficult, particularly Shaker style doors, probably one of the least intricate doors to build, providing you have suitable tools of course. Do you have a table saw? Or a router table with a basic set of cutters. Of course if you are only producing a single door then some basic hand tools, including a plough plane would suffice.
You will also have to consider the finish top coat, I assume lacquer? Again, easy to apply.
There are plenty of books (mainly American) available on how to build kitchen cabinets/doors if you wish to invest and don't mind buying second hand from Amazon. I have several, and to be fair very simple to follow with excellent illustrations.
Having someone build a single door for you (if you can find someone) could be quite cost prohibitive.
Good luck with it.
David