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.