I like the 'If the steerer is the right length".. ..Then a plug that is bonded in will work..
A Loc Tite product could be used to put an aluminum plug in, and given Loc Tite breaks down when heated
If removal is needed, it's possible, which is more difficult with Epoxy.
anyone with a lathe can turn a plug down to fit , and M6 thread the inside of the plug
for the pre-load adjustment bolt. for a Time trial bike It will be light and simple.