The rtl838x chipsets do have support in OpenWrt. I don't know about the rtl836x series.
Assuming that the Realtek chipset can be or is now supported, the next question is how much RAM and flash storage is onboard. The device would need to have 16MB minimum for flash storage, and 128MB of RAM (8MB flash + 64MB RAM is supported in 24.10, but this is expected to increase to 16/128 in future versions; it's unlikely that anyone would put in development efforts for a device that won't be compatible past 24.10).
Certainly this would apply, even if the device can be supported at the technical level. That's where you come in -- you have the device in hand and can begin the discovery and potential development efforts.