Is quite simple to do in bitcoinj. Do you have a format in mind? If so send me an sample will see what I can do. Please DOUBLE check it is signed correctly! Make it a transaction that sends to my address below and I will have more motivation!

I was thinking that if www.bitaddress.org could also create/sign transactions (not trival as need to link all the inputs), then if you had this web site you could then create transaction totally offline.