I haven't written any Bedrock assembly yet. But a few months ago I read the spec and bookmarked it as something interesting. I am toying with the idea of creating a disassembler for it now.
Oh cool, that'd be great! I'm wanting to write a disassembler in the future as part of a dedicated debugger for Bedrock programs. If you end up writing down any plans I'd love to take a look or help you out, my email address is ben@derelict.engineering.