Michael Neal wrote:
Most Judo throws as far as I can tell are in Aikido as well, they just aren't practiced as much. Seionage is included in the koshinage repetoire as far as I know ....
It may not be exactly the same, though, as the theoreitcal underpinnings of the techniques are slightly different. And I saw a higher ranking student have trouble getting the hang of the Koshi Nage breakfall, so it's not the easiest thing to learn. If Seionage is harder than koshi nage on top of that, then that would not be a pleasant experience for someone on the receiving end.
You have to take the abilities and safety of your partners into account. If they can handle it and consent to doing it, fine. Otherwise, I think you should pull back.