Might not be what you're looking for, but I have this "YMC Headphone Holder Tambourine Holder Hanger Clip for Microphone/Musical Stand, Black". I attached it to the bottom of a cymbal mount instead of the rack on my Roland kit. Maybe there's something similar in your part of the world.
https://www.amazon.com/dp/B008FW74J0/ref=cm_sw_em_r_mt_dp_lc0cGbBZF12HX?_encoding=UTF8&psc=1
i use these on my lamp post next to my desk for my k7xxs, might also work on a desk leg
hang it on the rings and not the headband.
I use this hooked to the lamp next to my desk. May also work on desk legs if they are skinny.
Home Improvement stores have clamps that may work for you as well, for about 1 dollar. http://www.homedepot.com/p/HDX-2-in-Spring-Clamp-80002/100027346