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sorry for the super long reply...
whole conversion was actually done around two years back when i have no choice but to do it, rear brakes gave me problem first, realize it's not functioning and my mechanic suggest me to replace brake shoe, it works, but only last me one to two months before the problem came back. then after all kind of testing and inspecting, still couldn't get it done, i got fed up and forgot about it after some time...
i thought it's ok since front brake is still functioning until one day front brake caliper is jammed, my Ferodo brake pad finished in less then 10kkm. no choice i have to do something about it, got myself a set of Myvi brake set, totally plug n play into Kenari without modify anything.
was so happy until when i start to drive it hard and realize because the rear brake not working, the front locked up too easily even dry road. another no choice but to fork out few hundreds ringgit to get the rear to work, ended up with my current rear disc brake. the rear disc brake i get to bought is already converted to direct fit Kenari, modification was done by supplier, buy then plug n play.
currently my rear disc brake served as normal brake + hand brake. yes as you guys mentioned, it's not so good after the conversion, scared you to shit especially when the brake pad is new because it haven't run in. been running it for two years, i would say not too bad, still manage to park the car at slope with handbrake only, but don't think much people can put down the handbrake as i need to pull it to very high position. and also, car won't even slow down with just the handbrake compare to drum brake if using disc brake. i came to this summary:
CLARIFICATION on why handbrake on rear brake disc conversion not as good as original drum brake:
1. new brake pad. brake pad needs to run in before fully works. from my experience, give it a 5k~10kkm...
2. the end of handbrake cable X rear brake caliper is not allowed to have freeplay.
3. naturally handbrake by drum works better then disc.
i'm running on ATR K-Sport, two size available, 165/55R14 (stock Kenari size) and 165/50R15. i'm using the 14" Myvi SE rim. if you're into real performance, get this tire, but, life spend of this tire is half or even lesser then standard road tire. i had a pair changed on early of March this year, another pair on July ago. one of the pair need to replace i think around CNY next year
CLARIFICATION on semi slick tire
1. it's legal (because no one say it's not illegal).
2. semi slick is alright under the wet condition, with three condition: 1. keeps your eye open real big, don't drive over standing water puddle on high speed, let say 60km/h on 1" standing water puddle? 2. tire thread is used to expelled the water from beneath the tire, it works the same like standard road tire, without tire thread either on standard road tire or semi slick, you're in deep shit. so don't put the blame on semi slick. 3. ask me on TT
again, sorry for the super long reply...

i like reading long reply as more details are written and more knowledge can be gained from there. haha!
i was thinking to replace to ATR K-Sport for my next tyre change but i believe it is quite scary to drive it during wet conditions as i cant go more than 60 kmh. Better use back my Kumho SPT for next change as i am quite satisfied with this tyre.
i think we should come out for a TT session to learn more from each other. haha!