Merge Site feed 1 comment post feed

Hi,

it is not easy to explain. All I want is to merge

1.) https://www.knowtebook.com/feed and
2.) https://www.knowtebook.com/community-link-feed-1112.htm/feed

into one single feed. I do not want to use merge tools like yahoo pipe or something else, because I already have synced the 1. feed with feedburner and want to keep the adress https://www.knowtebook.com/feed for my existing users.

So there actually comes to my mind to hardcode it, but how would i do this?