Finally got 'em, playing Quick variant. I had 4 losses to Moreric, Chrofuze, Arial, and Chrcord. Their respective causes were deckout due to massive Bone Wall, two Pharaohs I couldn't kill, two FFQs I couldn't kill, and an overwhelming of creatures due to 3 Hourglasses.
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The last cards to be unupgraded were Sundials and Fire Shields. The RT and Time Pendulum are there so that the deck is legal.
I found it interesting how the gap in difficulty for HBs far exceeds that for FGs. One game you have Arial, who is spawning two fireflies every turn with a few dragons to boot, and then later you have Aethes (my final opponent) who begins the game with a Spark+Salvager combo and later in the game plays PU on a Salvager, twice.
Ultimately there was a lot of luck in the last couple games, where my deck was extremely weak due to its difficulty in playing its Sundials. I was fortunate not to have a difficult opponent twice in a row. It really might not have made it if I were unupgrading 1 card at a time.