Upgrading Bullion rewards

For some reason I can’t find this anymore, and hoping maybe someone knows? I’ve currently gotten a Champion track weapon for my alt hunter which is obviously awesome, but I’ll also obviously be buying the Rashon from the bullion vendor at some point, as it’s BIS and you can simply BUY it. But what I don’t know:
a) How do the upgrades for the bullion items work? Is it crests and stones like everything else?
b) If so, does it respect previously owned item level bonuses like normal gear?

Where I’m getting at with this, should I upgrade my current champion item and expect to see just a ‘flightstones’ upgrade option for Rashon when I buy it? I don’t want to blow currency on my current weapon if it won’t translate over to the bullion item, but if it does it seems smart to upgrade my current one to benefit the Rashon I buy when I buy it. I’m okay with wasted flightstones that’s just time spent, it’s the crests I worry more about.

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Crests and stone like everything else

And it does respect if youve had items on that slot before to apply a discount

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They are currently not behaving like normal gear. I have a 1/12 Awakened Dreambinder from the vendor and a 506 Obsidian Stirring Staff from the Raid. It is still asking me for Crests as well as Flightsrones.