i'm not sure about the UIX dash.
If you want to buy an adapter, i'd buy one and see how it works for you.
for almost all games and all dvds, its much cheaper to make an adapter (check my sig for a tutorial). it only costs about $20 to make a cable, and is fairly easy, so 2 would be $40 instead of $160 for 2 x2vga adapters.
If your projector is running in HD mode, then there will be no improvement since the x2vga and homemade cable will output the same signal as the component.
If your TV supports 480p, i'd suggest running an xbox component cable to it. these cables are only about $10 used at gamestop or on ebay.
Since both of these displays probably accept YPbPr component input, there is no point in buying an adapter.
also, if these displays support 480i (as they probably do), theres no reason to need to hex edit the msdash or the UIX dash since it will show up, and who really needs the dash to be in 480p?