While I don't think that, if seen in a vacuum, this is a bad idea, I think in the context of Mordheim its not a great one. I've always thought that one of the biggest selling points for Mordheim, when trying to recruit new players, is that if they already play WHFB or 40k then they already have the basics of Mordheim down, and introducing a different dice system sets up another roadblock.
I think if the existing members of your group agree to this, thats great and you should definitely give it a go, but I also think you'll have a harder time getting new people on board.
Also, and i'm sorry this is off topic, but I just had a look through of your Asur list on that other thread, and there were some things I liked a lot in it. Frail but Fey is a nice rule, though I'm not sure it 100% follows fluff, doesn't Teclis have toughness 2? However, the big thing that caught my either though was how obscennnnnnnely undercosted all the heroes were. 70gc for the leader? With 4 stat improvements over a mercenary captain and a built in additional special rule, on top of the other beneficial rules Elves have? By my count, he would have clocked in more around 90gc. Not even to mention how powerful some of those "style" options are. Say he starts with way of the swooping eagle, then straight out of the gate he's attacking with str 5, -3 to opponent armor saves (essentially negating ANY armor combination in the game short of gromil and a shield or a horse being involved), and he'll almost always be attacking first thanks to his high initiative and charge range. Or the way of the willow branch, effectively always giving him double the WS of his opponent. These are very, very, very strong rules that by my estimation should take him well beyond only costing 10gc more than a Captain. Not to mention that he's just one of 4 warband members capable of doing these things. Honestly, I wouldn't play against this warband as is. Don't get me wrong, I'm not necessarily knocking it or saying its terrible or anything, since apparently its the consensus your group came to, but I'd be interested in how you figured their costs?