I have a Luzhong TC254 which is similar to a Jinma 254. I changed the 3 point mount to a subframe mount. It's held up well. I've pulled out many large stumps without a problem. I posted a thread on this forum some time back, but the complete thread is broken. It was also posted on Tractor by with the title:
An “axle-surrounding” type backhoe subframe
It may give you some ideas.
Unfortunately the link function on this site appears not to be functioning.
Len