This seems relatively easy, As I already have 20+ youtube channels, few with over 100 subscribers and my main channel with 700 subs. With my channels comments it will look real and i will watch the full videos to think of really good positive comment that relates to the video.
I didn't quite understand what you are asking for me to do, so thats my proposal and hopefully you pick me and explain me what to do, if i misunderstood.
Thanks