I believe there is much, much more to converting a Tr1 Tripehoon to a Tr2 than loading a bit of modified software and a bracket change for a new radar.
Indeed, so much work that I don't think it can be done "economically". (which might well be a ball/deal-breaking decider in the future)
Heavier Airframe = more powerful engines, new heavier capability Landing Gear, new landing gear support structures, possibly new wings for new structures....and if that work is done by the slowest workers in UK (possibly by someone "oop noorth") - that would be about 2+ years per AC.
Thats beginning to sound like a whole fleet of "Nimrod" Mods to me.
...now - when did you want these for?
It might preserve a failing old industry for a few years though?