I know they have been made for people, custom artisan style, so all sorts of funky colours and different profiles.
I also know that there are small sets of odd caps like the bigger than ISO return keys available on aliexpress and such, there are also other space bars available.
The most important thing right now is what size is the space bar you need and what mounts is it underneath, all cherry or costar, stem positions and so on.
Edit: Okay, just had a look again at the original picture. All the other keys you can get, iam am pretty sure of it. The hardest ones would be the two CTRL keys but I am pretty sure they are gettable. The space bar might be, one way or another but yeah get the size and a picture of the under side and I can have a good search for them.
Edit 2: Looks.like a 7.5u or 7.75u space bar from pictures online, but I will let you get the proper size.