First thing - congrats for even getting this far; most people don't.

Second - we can't tell you what to do; we can offer opinions though. Just keep in mind that our opinions, while well-intentioned, come from our own experiences and as such will be what we would do in that situation. We aren't you and so take what we say with a grain of salt.

Third - The demo approach is best in this situation IMO.

Fourth - Why are you asking us? Your partner/friend should really be handling this side of it IMO. If you trust him/her to be your partner then you should trust that person's experience and suggestions. I guess my question should be re-phrased as, "Why are you the one asking us and not your partner?" This is a biz dev question for sure.