I had an Amstrad PC1512 back in the day, so that keyboard looks familiar. Unfortunately, I haven't heard of any converters.
A quick Google
found this:
For nearly all models of Amstrad XT, the keyboard and mouse are unique and cannot be used on anything else. The exception is the PC5086 keyboard; it has a switch on the back which can put it into XT mode (for the PC5086) or AT mode (for other PCs). Similarly the PC5086 mouse appears to be of standard PS/2 type.
I regularly use mid 80s IBMs with
Soarer's Converter which is awesome, quite easy to make, and would do everything you want IF it supported this keyboard. Sadly not. I also don't see these old Amstrads on
Hasu's supported list for
his converter, which is just as good.
Adding a whole new protocol is a lot of work and well beyond my abilities. But it may be done someday. Soarer surprised me by adding Wyse support to his converter recently.
