This doesn't answer your question, but it's a little tip I use.
Before hitting reply, select the text you want to be included in the reply.
For example, if your replying to one question in their body of text, highlight the relevant words, and then hit reply.
This will create a new email, with only the text you highlighted underneath.
I supose you could try and highlight "nothing" (A blank space) before hitting reply, and this might achieve your desired result.
I don't have my iPad at hand to try this.