Hello Sir, I have worked with Telegram API bots projects, including send and re-sending message to different groups, I have done the exactly bot that you want on the past using a normal user account so you do not need to be admin of the channel.
Said that, I believe I have the right skills to make your bot with all the functions that you need.
Can you send me a message so we can chat about all of your bot requirements?
Maybe I can fast code a free sample for you before you choosing a freelancer. What you think?