Does it have to be new?
If used many options for 4 cylinders japan naked bike
kawasaki z900 or suzuki gsx-s750 are both solid choice.
Both can be found under 40k

for sport bike.. only cbr650r fits your criteria but like the cb650, would be over your budget

other than 4 cylinders, you have ninja 650 and z650, they are also beginner friendly

If new I'd pick cfmoto over the qjmotor, cfmoto simply has better finish and feels more premium

srk600 isnt that bad maybe you'd actually like it when you get on it. I've seen some of them on the road

I was about to give suggestion.  but after seeing you like chinese bikes.  it's OK lah

if you can, just get jap bikes.

will this bike be your daily commute bike?
or just a hobby weekend bike?

paling simple lah
you sewa that bike for 1 week, try ride it, suka? go buy.. tak suka? sewa other targeted bike

what bike you really like?
have you tested it and still like it?

don't waste 40k because you compromise on a bike you don't like
end up it's a 40k regret and you lose more money in trying to sell it for another bike

aim for the one
save for the one

either you can afford it, or not at all
compromise your buying decision based on budget is the worst thing you will do in buying a motorcycle
"what if I had extra 7k and bought that CBR instead"
"what if I had bought a used CBR for the same price instead"
"that S1000RR/GSXR/ZXR/R1/CBR1000RR is only 46~48k"
in the end, get the bike you really want
every purchase decision can be a costly mistake, and you end up spending more to fix it later on

also see what is your riding experience la

if me, 40k, I'll get a used 1000cc sports bike and be happy

are you sure this is what you want as a first bike? all the bikes you listed arent beginner friendly.. buy new also guarantee to drop 

i think imotorbike is a good place to buy.. one user just bought mt09 v3 from there