Well I was thinking of a modification to sympathy. Yes, bonds aren't permanent. More dissimilar the objects are the more energy that needs to be expended to create the link. The modification I was thinking is creating two different types of bonds.
1. Potential bonds - These are just links, through which no information or energy can be transferred. Can only be used for tracking. Will not require much energy to maintain such a bond.
2. Kinetic bonds - There are bonds that allow the transfer of energy. A bit sympathy this is for energy transfer. This will not onle require energy to maintain the bond but also a burst of energy to transfer "things" across the channel. This could be used as a radio or as a way to buff during battles.
Also, I realize all these are just ideas. If they seem to fit your character more, please use them. :)
Sorry, I realize all this is unnecessary for the story, but I am enjoying it and thank you for supporting it :)