Are there any converse shin high boots?

Bomber

Like this? I have no idea what to search to find something like this!

zombietaggerung

This set has a pair: https://www.daz3d.com/gothy-punk-for-teen-raven-8-and-genesis-8-females and it autofits to G8M just fine if that's a factor for you.

Bomber

Thanks. That's nearly perfect! 
 

Are the soles adjustable?

zombietaggerung

They are not, no.