i honestly dont see the huge problem with strteching with pinchers or spirals, i do understand the uneven wearable surface that may lead to uneven stretching, but that seems very neglibel, as long as u swap it for appropriate jewelry after ur ears are adjusted to the stretch, after a few hours or so. and as long as the spirals arent in for extended wear such as sleep.
and as far as omegas, i agree with elizabeth, they look oddly shaped and they are not very tapered to begin with so it wouldnt be much fun. so stick to a taper and plug, pincher or spiral, or tape