I was just browsing Amazon for Christmas gift ideas when I came across a toy line from a company called "Ingenious Toys", who seem to be a distributor of imitation Lego sets (similar say to "Mega Blocks") produced by various different Chinese manufacturers.
Anyway, they do this rather interesting looking Dawn Treader Set:
https://www.amazon.co.uk/Ingenious-Toys ... Toys%C2%AE
They seemingly do a few other products in their "Narnia-inspired" range based on the thumbnails - though one looks like a knock-off version of The Black Pearl lego set from Pirates of the Caribbean, and the other looks more like something out of How To Train Your Dragon than Narnia.... there's also one available (not pictured) which contains Peter and Susan minifigures alongside two Zombie-looking pirates called "Wiliam" and "Healtoan" for some inexplicable reason. (product links below)
Dawn Treader Ship Playset
https://www.amazon.co.uk/Ingenious-Toys ... Q1M71H6PNH
Lighthouse Playset:
https://www.amazon.co.uk/Ingenious-Toys ... Toys%C2%AE
Pirate Ship Playset:
https://www.amazon.co.uk/Ingenious-Toys ... nious+toys
I found some more toy sets in this series on different websites...
The first includes a couple more random playsets which don't really seem to correspond to very much - perhaps there is supposed to be some sort of correlation between these and each of the islands from Voyage of the Dawn Treader, but if there is I can't decipher it....
Tower Bay Attack Playset:
https://www.amazon.co.uk/Ingenious-Toys ... dpSrc="srch"
Ghost Pirate Hideout
https://www.aliexpress.com/item/KAZI-Na ... 64958.html
There is also a range of smaller, chunkier looking ships, which includes another Dawn Treader. Although not as good as the main set, if would be a cheaper way to acquire all the Minifigs if that was your thing.
I could see the second set, the one with purple flowers, being the Magician's House, and the third one involving the sacrifices to the Green Mist (so, being based more on concept art for the movie?) but I haven't come up with any possibilities for the first one.
They are pretty neat looking sets, all in all.
We have hands that fashion and heads that know,
But our hearts we lost - how long ago! -- G. K. Chesterton