Any way to work with embedded bytecode inline (without splitting it out into it's own file)?

[0xAdk]

I have a program that has it's own interpreter with byte code embedded. I've look around trying to figure out if there was a way to mark a region as a different language but couldn't find anything.

I've written a little sleigh to parse the bytecode and I am able to select a memory region and use extract and import context option, select the language, and see it parsed correctly in a separate file. So my idea from there was to overlay that with a memory map onto the current program but the file doesn't exist since it seems I need to add it with File > Add to Program, but that grays out the language box with it preset to the current programs language.

Is there anyway to get this to work, or more generally deal with one language embedded into another without having to split out the file?