The Channel Islands?

[Jolt]

I'm certain Channel Islands are important to its nationals

As you history within the timeframe of Empire is little, and non-significant. I wouldn't mind having Channel Islands if 80% other more strategic archipelagoes appeared. I'll clarify this later

Bleh, this needs not clarifying as other people have already said it for me. For the Channel Archipelago, to be in, we'd have to see basically every archipelago from England to India. Azores, Madeira, Canaries, Gorée, Cape Verde, Asunción Island, São Tomé, Mauritius, Zanzibar, Seychelles, Reunión, Maldives, Laccadives and Nicobar Islands. And I'm saying those that actually make sense (and those which I instantly remember as important) entering the game. Every single island of those deserves to be in way, way before Channel islands can even be considered.
They were simply historically non-important, and noone cared about them, except those who exerted control over it. They were not populous, they were not strategically placed, they had no relevant resource, etc, etc, etc.