Since removing a channel is somewhat of a PIA, you should consider posting a new feed file that contains only one video. The video should explain that your channel is "currently under construction". When you have finished your transition, simply update the current feed file with one that points to the new video location.
FREE Windows desktop software for converting Direct Publisher channels to SceneGraph (SDK), for creating
BIF (Trick Play) files,
Roku (MRSS, JSON) feed files, and
FireTV feed files @
GitHub/rrirower.