Forget all the BS. Can you, like Bangkok, smell the chorine???? If not then go for all the hi-tech filtration.
If you are not going to drink it, just buy bottles and shower in whatever you have.
I used to ride an NSR150R. Bit quicker than a RS but definitely OK for touring. Stick a Givi box on the back and you are good to go. OK for 250 kms a day in Indonesia.
You have to learn how to carry it looking cool???? Difficult to describe. Hand inside under the strap, then resting on rim. It becomes almost part of you and you can use it like a basket if in 7-Eleven/Tops. et al.
For urban/suburban transport the Click, hands down.
I always carry my helmet. Gives me an excuse for having a bad hair day. OK, actually a no hair day but...
I have a friend with one. He likes it. But you'll have to get used to changing gears again. He trundles along at an indicated 90 kph.
For in and around Pattaya I'm still going with Zoomer. Changing gears does dictate what footwear you use. I don't wear dress shoes on my motorcycle.
Have a look at Honda Zoomer. Will cruise at 80-85 kph, is easy in traffic
a breeze to park and resembles a proper motorbike. Bonus? You can squeeze/transport a box of wine on the floor. Add the optional under seat plastic box and the storage is good.
If you are going to do more touring than Pattaya then a Honda CT125