"Wings Over the Fleet" has a T.199RN variant that looks interesting.
I'm thinking of an enlarged airframe as a T.188R recce aircraft with Gyron Major engines (essentially Gyrons upgraded parallel to how the original J58 was developed into the J58 that flew in the SR71 et al.) In practical terms, start from a 1/48 T.188A, use engine nacelles from a 1/72 SR-71 and with the cockpit converted to side-by-side, two-seat cockpit in 1/72.
