I was mention if it was at all possible to delete accounts while maintaining the posts, even if under guest, gaijin, I apologise if I've given the impression of wanting to prune my posts clean.
Since its been mentioned a few times now the software doesnt allow this I reckon its case closed, delete what profile and account stuff you can, change name to no lnoger a user in the title bar, and change the password to something you wont remember.
thanks for the responses to this query everyone.