I am not chock full of ideas, but I can tell you a couple things I know.
One of our YW said that she wants to learn useful skills like budgeting, cooking, care maintenance etc., because she is recognizing that she will soon be living on her own and she wants to be prepared.
Fundraising in the church is discouraged, except under very specific conditions. See Church Handbook 13.6.8, so anything you do there would definitely have to be cleared with the Bishop. I'm not sure about soliciting materials - I know that the church is somewhat specific on that, but the paragraph about it was hard to find. BUT, I love the idea of helping to set up the school room for the homeless shelter. Are they gearing it towards adults or children? You could make school supplies for kids like book bags, soft ABC books, etc. Or make curtains or cozy cushions for seating. Make mini chalkboards for practicing writing skills? I don't know. This is not my forte.
I like the idea of using your Dad as a speaker! Especially if he's funny. ;-)
Another educational topic would be First Aid, which is something from my growing up years that I have used over and over again as a Mom (thanks to the Red Cross babysitting class and Girls Camp for the knowledge!).
Your ideas so far sound great. I am getting to be a bigger and bigger proponent of RS and YW meeting together more often. I think YW need to think of Relief Society as an extension of Young Women, and not as a separate and totally lame program for old ladies. ;-)