Is there a way to convert Steamworks Trinkets into Lounge Trinkets? I remember something like that from years ago, but darned if I can't find it.

nope, there isn't anything like that (and never was oO)! You can only buy steamwork trinkets with lounge trinkets, not the other way round :( .. or just try to find someone who is willing to trade?

There's a suggestion lounge trinket bag to make lounge bags for sale in the steamworks shop if you would like to add your support.

I'm happy to trade Lounge for Steamworks! But we never had Steamworks to Lounge; there was staff input on it the last time, but I don't recall what it was.

You could always make a topic in the Wanted section of the Advertising forum! I literally just agreed to sell all my Lounge trinkets via a trade (I buy certain Lounge items, they buy certain Menagerie items), otherwise I would offer them to you.

I trade mine 1:1 so I can get lounge trinkets and others can get their steamworks for cheaper than doing the bags in the shop. Win-win!