aesthetic always come with the price;

If don't want to hack, just lay a wire and put another layer of plastering, this mean the entire wall need to replaster. This how some Singapore HDB is doing since thec can't hack the wall, they can plaster another artificial wall, usually doing that for hot water and wiring too.

or Make it industrial feel, expose a GI tube. Need a good workmanship.

Both method will not be cheap.

Want cheap just install normal extension, RM 30 kautim.

Either pay for hacking, invest in eubiq, or live with it.

Exposed Gi are more expensive than hacking. Is the detail skill that are costly.