hortigal,
If I can make a suggestion. One the Adenium forum, there is someone wanting to trade Adenium seeds from their plant. May send some for postage if they don't trade.
Also, on the Plumeria forum, there many avid growers and sometimes have seed to give away. Possibly post a note on this forum.
The Adeniums & Plumeria will not produce true to seed, but can get some interesting seedlings sometime.
Rick