I can't root my Oppo K1 nor instal custom recovery. Please help!

Hi. My phone is Oppo K1 (PBCM30) running Android 8.1.0 with ColorOS V5.2. I buy this phone through AliExpreess, since this phone not yet available in my country, thus give me ColorOS version which designed specifically for China region. I tried many attempt to root my phone with no avail. The closest way to ALMOST successfully root is to install Kingroot, but is is blocked by installation security with message "A high risk threat has been detected. The system has prohibited this installation. This app contain following risk: It contains the root permission, the highest phone permission, which once obtained by an app, can be use to maliciously control your phone." And before you ask, YES, I have enabled the Install From Unknown Source option.
Other way to root that I've tried is to flash SuperSU. But this way requires me to install custom recovery first, which of course impossible for me since the requirement to install custom recovery is the phone has been rooted. Besides, it look like there's no version of TWRP available for this phone yet. Another attempt (by Kingoroot, iRoot, and all kind of ways-to-root, both with and without PC) has failed miserably.
I love this phone, but it really drives me crazy with it's unrootable state. Please help me!!

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