Jibin: Hi , I'm Spike99 from northern Wisconsin. Here's my solution....
I have a XW-P1g that I added guitar strap buttons to. I backed up the inside of the plastic with small pieces of hardwood .( I used ash wood from a drumstick that I cut to a small cubed size with a hack saw.) I opened the Keyboard and glued them in place where the screws would be put with 5min. epoxy. I then drilled pilot holes before screwing in the buttons, one on each side of the keyboard. I set them back about 2" back from the tapered front (that faces you as you play) .I used gold colored strap buttons because I have the 'Gold synth. It takes 6D cells that are admittedly kind of bulky/ heavy. I then bought a good wireless instrument system to plug into the quarter inch left/mono output.,
( I like 'Sennheiser) ... I had to make a strap out of 2 guitar straps because they didn't have one at any music store I went to that was long enough. This synth has great presence/ flexibility / & frees you up to walk or move around. (great for open mic's/ jam's etc.) It looks much heavier than it actually is. (about 13lb)
It's like a keytar but much more powerful. & wide in its range of sound / deep editing. I use it for 'Bass, Piano, Organ, 'killer Saxophone, & odd ball sounds like vibes/ harmonium,
banjo, & guitar..When I jam, if I like the song we just played I add 'crowd applause from the 'PCM varoius button (key=E5) It always gets a big laugh from the jammer's/ crowd!
This was a great alternative for me to use rather than a separate tone source / keytar / Midi cable that always includes some delay,.... Best Wishes, Spike' 1/19/17