the problem with giving "only" to void dwellers things , is that other may ask " why we can't do it?" ... since void dwellers are not exatly another kind or strange xenoforms.
my closet dream is for voidborn to be trasformed in an "horde" like gameplay. where they have movable " habitats " that can move from system to system , that receive particolar bonus while in orbit of different kind of objects , and while inside another empire to give bonus\malus ( like increase trade value , piracy , criminality etc. ) capable of raiding empires that close borders to them becoming " aggressive " while inside theyr systems .
edit: to incentivate the "roaming" they could have a bonus when enteryng a new system, and a buildup malus overtime for staying in the same system .
edit2: now that i think about , they would work so damn well with the new vassals system . as they have no interest in actualy conquering systems , they could wage wars in order to vassalize static empires , while waging war against other hordes to take control of them (or vassalize )
i would like for void dwellers to have a very different game-style , renouncing to planets complety in order to have a very special origin .