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Removing an existing eMMC without damage is hard. Soldering one in with a cheap Chinese BGA rework station as the first part on a new PCB is easy. Harder on an existing PCB without masks, heatsinks and tape.
There is also a tendency for neighbouring parts to come off or loose when removing anything like an eMMC. Non-BGA parts are usually just cut off at the body, legs/pads cleaned and new part soldered on. Even a metric fine pitch 80 lead IC can be soldered simply by reflowing the legs on tinned clean pads with a regular 3mm wedge tip iron.
Thus unless the eMMC has accessible leads and you are experienced at SMD rework forget it. I've been replacing SMD ICs, transistors, resistors and capacitors for decades successfully, but never attempting to use an IC after. I've removed, tested and replaced the same SMD transistor or regulator, but I just cut ICs at the body.
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