Interesting read. I thought EVA is very stingy overall, given how bad its own FFP is :P
but looks like it's entirely possible to hope

I'm flying YYZ-TPE as Star Gold this week, on a almost-sold-out flight (77N) but EF shows 4 open C class.
I can only hope as Economy (B class), and flying alone

I tried to do Star Alliance Upgrade for 25K but no inventory available