No. nopedy nope nope nope.
Ultimate's main perk is Fly. Just like Elite is /fix. You can't take away the main perk of a rank 'Just for the shear fun of it'.
Not only exclusives + need to explore, to find people in spawn. I reckon more cits do Hide n Seeks then anyone else, why not give everyone Fly! Yep sure, just for the fun. Just no, pls.
If you want to fly, pay the money, like everyone else has. And if you cant pay the money, pay the meebles, simples.