A GAS engine instead of a glow 1.20 ?
These scale birds are already heavily wing loaded. More weight is not gonna help. These are .60-.90 size planes and 1.20s are not bad but already kinda pushing it already. The RCS 140 seems a good fit and is very lightweight. The MVVS 1.60 is a bit heavier and might work. Any of the Zenoah would be way too heavy. G23 weighs over 50 Oz. while most 1.20 are in the low 30 Oz. range. One lbs is a lot of different in a plane this size and type.
About the MVVS being sourced overseas, unless one lives next door to Morris Hobbies, any warranty service work and parts would be obtained through the mail anyway. These days, shipping charges are not too much different whether it is 200 or 2000 miles away. I wouldn't fret it if there's a substantial amount of savings involved.