I like the milk crate idea but I don’t have access to the kid until we are on a 7 day trip. Your link for the Wenonah seat bracket would work but better than that it gave me the idea for making a vertically adjustable seat bracket and how to mount it without drilling holes in the top of the gunnel.
As far as having a bracket mounted seat somewhat height adjustable have a look at this link. Scroll to the bottom of the link for a photo illustration of how Mohawk’s seat brackets adjustable for height.
https://mohawkcanoes.com/products/seats-seat-backs/
I can not address whether your Magic has enough structural rigidity along the sheer to accommodate a hung seat; I have no clue about the layup schedule, partials and etc were used in Bell’s various Fiberlar/KevKrystal/etc composites over the years, or whether a seat hung from aluminum rails mounted close to the front thwart would damage the hull with a 60lb load. I tend to doubt it; it works as adult seating with Wenonah’s ultra-light kevlar layups and seats hung close to thwarts.
Having somewhat hesitantly offered a boat tinkerers suggest to your specific question I will join in offering a
strong word of caution about adding a paddling height bow seat to a narrow gunwale canoe like the Magic. The difficulty there, in fact the danger, is that for shortstuff to reach the water effectively with a kid sized paddle the seat will need to be mounted fairly high in the narrowing confines of the bow, and one of the quickest and surest ways to capsize a canoe is to get the paddler’s head out beyond the gunwale.
If the kid was going to be a passenger lump, a non-paddling “duffle” seated low in the bow, that head-past-the-gunwales stability issue would be less of a concern.
The flip side of that non-paddler passenger lump solution is likely a bored and disinterested kid. The scenario solution changes between a one time or maybe annual trip (I was picturing a day paddle outing) and a weeklong effort, especially without a pre-trip test. Think kid reaching out for something in the water, crossing a strong eddyline, broadside wave, moment of inattention.
It’s not my place to tell anyone what they should or should not do with their canoe, but committing to a weeklong trip, with a child bowman, using an untested boat modification in a narrow hull like the Magic, without prior proof of concept would present too many risky unknowns for me.
I will offer this from the perspective of raising two sons from toddler age in the bow of tripping canoes. We first started off with them as mid-ship passenger lumps, seated low in the belly of a tandem and they were quickly bored, disinterested and grumpy. Our solution was to put them in the front of a symmetrical tandem paddled bow backwards (ie, with the adult in the bow seat facing the stern).
That trimmed the canoe and put them in seat that was high enough for them to actually paddle to some effect, sitting between gunwales far enough apart to eliminate the probability of a head-over-gunwales ooops.
When they outgrew those narrow confines we flipped the canoes around bow forwards and got a few more years use out of those boats before each son went into their own small solo pack canoe (Old Town Rushton and Dagger Tupelo). At that point they had some years of paddling practice and were comfortable and confident paddling solo.
One happy result of that solution was that both, now in their twenties, still enjoy paddling.
We started in the most plebian hulls around, an Old Town Camper and Pathfinder. Not fast, not sexy, but they worked well for a decade when we family paddled together every month of the year.
It is not the solution you sought, but could you borrow or rent a symmetrical tandem for this week long trip? A design that lacks a thwart immediately behind the bow seat will swap ends without modification.
I too would like to see you and the kid have a safe and enjoyable trip, and maybe start a kid on a lifetime of paddling. I believe that the bow backwards tandem, borrowed, rented or even Chicago Craigslist used, would be your happiest and safest solution.
If you were closer I would lend you one myself.