I had a discussion about this a couple of WCSS's ago. If it were me, I would be giving a long, hard look at the air suspension systems the aftermarket is churning out for the EJ-powered platforms. With the 5-lug conversion becoming so popular, it only makes sense to use these new, modern air systems to replace the obsolete, NLA XT/XT6/early Legacy air suspension systems.
Yes, they are expensive, but you could probably forgo a management system and tank, since the XTs already have those components, saving some money there.