Have you looked at the Cambridge Diet at all? It's a VLCD and you can do SS+ which is where you have 3 products a day and then a small protien meal (I would say with veg but 80g really doesn't buy you much). I went with them rather than trying a VLCD on my own as the consultants have been very supportive. Or you could look at the Cambridge diet forums as there are a lot of people there as it seems a bit more active than this forum and they are basically doing what you were asking about above.
Or even just seeing what people there suggest for their one meal a day.....
Or even just seeing what people there suggest for their one meal a day.....