I did something similar to what you are proposing. As you know, DD3 has been shocking at night for, well forever, and I was so far beyond exhausted and not functioning well at all. I began not offering her a feed after her first night wake (usually around 10.30/11pm) and not before 6am. It worked really well for us, and fairly quickly and really very little complaint from her - made me kick myself for not trying it a bit earlier. I still got up for her and comforted her, offered her a drink of water etc but no boob. She is now waking only once per night for a feed - we even had four magical nights in a row when she slept from 8pm to 6am or so.