The stack of spacers does take on some reinforcing role.

Fortunately there the steerer is Metal.

I extended a too short steerer successfully with a BBB stem Riser..

It is a Quill internal, and is made so height is adjustable dependent
on how many of the included shims are used to be gripped by the stem.

A tall enough steerer, and I expect you can put the whole thing inside the steerer
and not only have a very strong tall fork,

But also not need a Starfangled nut.

They designed a bolt that is threaded inside the hex to tighten the quill-wedge.

I bought the BHP 21 for 1.125" fork, for a 1" fork they make a model BHP20./

NL based BBB has a US Distributor.