i think you can do it with existing channels, as long as your peer supports it!
And now for something … completely different.
nostr:npub1e0z776cpe0gllgktjk54fuzv8pdfxmq6smsmh8xd7t8s7n474n9smk0txy does splicing in CLN require opening a brand new channel? And do you know any public nodes that already support it? Feeling reckless...
Discussion
Thanks, that was also my guess from glancing over the spec and source code.