You would move the turbo mounted brake to the downpipe inline style under the cab. The brake for this is different. Probably bout as cheap to off your old brake in the classifieds and start with the proper one, if you go HX 40.
Seems like I priced another casting and hardware and was going to re-use the vacuum can and butterfly? It think the vendor sold me a new inline brake less the rest of the kit and some more lengths of vacuum tubing. It was easy to lengthen the wiring harness with some heat shrink, solder and wire.
Good luck and maybe the 16cm2 will hold your egt's in check.
Andy