Nardo:
I am sorry to the best of my knowledge there is no one who can reterminate the cable.
However, I would recommend that you keep at least the 3' section to show your cust. how an HDMI cable is made and why they should buy a better cable and spend the money to have it installed in conduit.
Talking with installing dealers I am starting to hear horror stories about HVAC, Security and Electricians damaging the cables by steping on them or streching them, as well as problems where cables are pulled thru the rafters and get pinched in the joints. Just as serious is doing hard bends as the cable comes out of the wall.
It is very important to understand that "ANY" deformation to the cable will render it useless.
Get a "CL" rated cable with a smooth & stiff jacket if you are not putting it in conduit.
If you are going further than 15 meters, spec in a signal repeater (get one that is HDMI certified). Plan on a soft bend going into/out of the wall.