Don't think this is possible, but thought I'd ask anyway...

Is there any way to set up Export to always export to a subdirectory (eg: always named 'converted') of the directory of the original RAW image. I often forget to simply "export" when moving to a new directory for the first time - since I usually 'Export with previous'
(keyboard short cut programmed into my wacom tablet).

tia

I too wanted the same feature but the answer is no you manually have to browse to the directory & create a sub folder, its so simple to do this but adobe has chosen not to implement this as yet.

Thats another example of LR forced workflow.