How to "rough in" front end alignment after rebuild?

ACME SS said

it would not work with wheels that you can not access the dust cap when they are installed, or am I missing something?

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They make adapters that clip to the outer rim with a round plate in the center for the magnetic gauge.Not my favorite but they work.
Mine came from Mac Tools but I believe Jegs or Summit has them. Cost is unknown by me.
Before I would use steel wheels exposing the hub with short tires so it was easier to reach the cam bolts.