Of course, if Disney were absolutely dead-set on bringing back Dreamfinder as a younger version of himself, they could justify the change by explaining that it's not an external redesign of the character by the Disney company, but rather an internal change that's
consistent with Dreamfinder's secret backstory.
Because... Dreamfinder is actually a Time Lord.
He hasn't been "redesigned"; he simply
regenerated himself into a younger body. (And
the Dream Machine is a TARDIS... Figment was
created to replace those unreliable human
companions...) Dreamfinder could even break
precedent by regenerating as a new
female
version -- a sassy, flirty redhead sure to elicit an
endless stream of questions from Figment!
OK, I'll stop.
After all, borrowing ideas from
another fictional universe isn't exactly the
highest use of
imagination...