Renars here from Excelify.
Sorry about replying in English here and thank you for suggesting the use of Excelify.
This is quite a tricky task to achieve. The main issue here is that Shopify API does not allow apps to see or set sales channels in the store. Apps can only adjust Online Store and PoS sales channels.
To manage Online Store and PoS sales channels with Excelify, here we do have a great tutorial on bulk publishing or unpublishing Products.
I hope that this could be useful for you, but as I understood that it might not be exactly what you are looking for.
If you have any further questions, you can always reach out to Excelify Japanese support directly.