Lets go bigger: Just using ford 300 straight sixes would keep the HP the same (or more) but cut half a ton from the weight. Also shocking to any Ford owner they would be more fuel efficient as they probably would eat less than 30 GPH. Maybe.

Use aluminum tubing instead of steel and a Gotha V obj 2030 could easily have half the weight of the original and several times the range, a ATACMS is just barely possible but a pair of PrSMs (or one with a glide kit) would bring the Gotha into the 21st century with a 1500+ mile strike range.

Any fools who point out that the missile costs several times what the aircraft does and that the airframe should just be a semi disposable unmanned range extender will be ignored as lacking honor and unworthy of Sto'vo'kor.