Submitted Sales Order Update Items change events

I have sales orders with child tables with items in them.

After the SO has been submitted, the UI allows these items to be altered.

I need a way to attach a script event (server or client side) to such events. For various reasons I have no access to python. I have to achieve this through the frontend only. Please bear in mind that most of the client side event hooks stop working once a document has been submitted. So, you can’t use the normal way.

Anybody have any idea how I can achieve this? There has to be a way or items contained in SO’s cannot be verified.