I like to have the steering tube taller, even on my threaded fork , for higher bars..

I'd add spacers .. on my touring bike I used a steel spacer tube.. and fitted a bell onto it.

as long as its threaded far enough to get the headset adjusted.. then make sure your stem wedge goes in far enough to reach below the treaded section ..

long quill Nitto Technomics are perfect there.. then the stem is reinforcing the threaded portion of the fork steerer,
and the actual clamping of the stem is, as I said, below the thread cutting..

have access to someone with the right thread cutting tap you can thread the spacer itself , to abundantly re inforce that section..

I have found tall nuts that are threaded all the way through

and thin ones, that I have paired together and lock-jammed them against each other to secure the adjustment ,
then the spacer and top lock nut, above them .. are not needing to hold the adjustment..

but I worked in Bike shops and snagged parts that didn't go on bikes, sold.. and had old parts bins to dig through..