Eva, just my two cents, but I think that may be over-complicating it.

Also, so many different kinds of phones out there ... iphones, newer iphones with different charging jacks, various LG and others ... I have at least three different "basic" charging cords home, and they are all quite "phone specific."

I think you can add enough sizzle to sell the kits without the need for a "tangible" product inside ... but that opinion comes from the comfort of my want-trepreneur recliner ... so ...