The route on the flat I think they would potentially be thinking of is something along the lines of what they did with Wicklow Brave (Ormonde Stakes/Irish St Leger/Yorkshire Cup/Goodwood Cup/Lonsdale Stakes/Ebor) i.e. races around 1m6f-2m.
If he is quick enough for 12F that opens up even more options so the Southwell race will probably be a lot more important to the continuation of his career than most think – I feel the Champion Hurdle could very well be the last roll of the dice for his jumping career if he hits the deck in it again.