Can i do the following?

1. Reveal repair order

2. Spend Engineering token

3. Exhaust Yularen for new engineering token

4. Spend new engineering token

Is this allowed? Seems like a great way to collect 8 engineering points for my ISD

No.

You can only Resolve a Command once per Turn...

You are resolving the command with the first Dial and Token...

You tally up your points, and when its done, its done.

You can get another Token back, but that's for later. You can't use it now, because you have already done the command once.