isn't this what being done around world now. SpaceX is putting 25-30 engines in their Starship.
Their Current Falcon 9 also has multiple Engines in their stages.
The way South Korea works, they will soon surpass ISRO too.
They started with a relatively kept quite deal with Russians and Naro-1 used Russian stage 1. Russian shared a lot of knowledge with them and South Korea soon developed their own version.