hdr or no hdr has nothing to do with the sended bit deep. the properties page is the part that controls what bitdeep is send to the driver and only the driver.
the tone map HDR using external 3DLUT should trigger HDR mode because it is supposed to send HDR meta data.
so this should get you 10bit+HDR+3DLUT.
beware that sending 10 bit more often than not results in more bit deep related problem than sending 8 bit.
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