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When it comes to battery issue, I removed 12v 100ah battery from my Toyota Hilux and tried to jumpstart, cranked slowly and killed that battery  too rapidly..

That sounds like a bad starter to me.  I've read about Xciting cold start issues, but I keep mine garaged and it's always over 50F in there.  If I don't run it for a while, it cranks slowly but hasn't failed yet.

I mostly stay in town on my Xciting 500, but my town's spread out with lots of open road.  I've had many large motorcycles over the years and enjoyed taking long day rides, but I've lost interest in that.  I found myself taking shorter and shorter rides, but wasn't ready to give up motorcycling entirely.  First, I got a Honda PCX 150 and it was fun for a while, but too small.  My Xciting is much better.  It'll easily cruise at 55-60 mph (about as fast as I want to go) and it's very comfortable the way I have it set up.  I use it for errands more than I did with my bigger motorcycles.  It's very dependable...you just get on and go!

I'm still thinking you need to buy a Kymco instrument panel.  I don't think they were made to be repaired, just replaced...Remove and Replace.  It would probably be cheaper than taking it to a mechanic and it should just plug right in.  If your scooter's doing everything else properly and your wiring harness is in good shape, there's not much else to rule out.  We don't have any mechanical or safety inspections around here, but I remember how strict some of the European inspections were. 

I think some people give up on solving their problems, like this guy.  I'm thinking of taking a trailer over and checking it out.
 https://albuquerque.craigslist.org/mcy/d/albuquerque-2009-kymco-xciting-500/6938609040.html
The ad didn't last long.  It was a red 2009 500RI with wiring problems and being sold as parts for $200.

I bought a 2008 carbed version for $1400 in February.  My LCD odometer and clock are shot and I had to change the left turn signal switch.  A new meter assembly will cost about $193 and shouldn't be difficult to replace.  I was kind of skeptical about buying a Chinese (actually Taiwanese) scooter, but read that Kymco's are pretty reliable.  I'm enjoying this scooter and prefer to keep it under 65 mph.  The previous owner maintained it pretty well and it's been reliable so far.  I keep it garaged, so I haven't had any cold start problems.  I'm about 6 feet tall so I took off the backrest pad, put on a memory foam car-seat cushion strapped down with an ATV seat pad (both available at Walmart) and it's now pretty comfortable.

I'm starting to think you need a new speedometer assembly.  Maybe something's gone haywire within the panel.  You live in a very hot climate, and that may have an effect on electronic devices.  My LCD odometer and clock are shot after 10 years and 15,000 miles in the desert.

Bad electrical connections or grounding can often cause strange things to happen.  My next major purchase will be a new speedometer ($193.00).  The LCD odometer and clock don't work right anymore.  It's nothing serious, but I like things to work right.