Hispec do solid & 2 piece discs (alloy bell) or at least did.
solid disc is basically a conversion from 278mm primera rear discs.
you can use primers 278mm discs & redrill for 4x100 stud pattern. make your own bracket or look into brackets off of nissan models that use these 278mm discs as you will find some fit & work fine on the gtir hub.
A pair of 278mm discs can cost as little as £30, you may even find 4x100 stud pattern if factors up to the search. If you find brackets to work in a breakers you got easy job, if not fabrication no too hard. splash shield needs be removed or reshaped for these discs..
All in that could be done for say £80 to £120
cheapest 280mm hispec is about £250 ...
Other option is keep an eye open for used hispec or godspeed kit come up in used sales/eBay etc.