I redeemed my Jelly Tokens for an Antigua (a 3* gun). I equipped it and joined a party at level 21, which gave me enough heat to complete level 1. I accessed the Forge at the arsenal pad at the beginning of level 22, and used 3 glowing fire crystals for a 100% success forge rate, and got a 25% heat boost. After level 22, I accessed the forge again in level 23 and used 6 glowing fire crystals (I have about 120) for another 100% successful forge and a double level bonus which took me to level 4. I played one more level and even though the heat indicator showed me not completing level 4 heat, the forge said I did, so I used the forge again with 18 crystals for 100% success to get it to level 5 – enough to craft the 4* gun, which I did with 3 elite orbs (free).
In summary, I did it in 3 levels using 27x3* fire crystals and 3x4* orbs – all free. Even though I used to be able to do it in 2 levels of Sovereign Slime or Roarmulus Twins missions (I always play the third level as well, though), the no-energy requirement for gates or crafting made it, all in all, a nice improvement for me.
Yes, you can't do heating runs in FSC anymore, but I rarely did that tedious, overly-long mission anyway. And I don't see making it take longer (maybe much longer) as a bad thing. The game is a lot less fun if you rush through everything anyway. The anticipation and ultimate is part of the fun, or it should be anway, and not seen as a "grind" or "work". And with no mist restrictions, I'd say it's a fair trade.
P.S. On a somewhat related note, I was sitting on seven level 10 Ash Tails which I hadn't gotten around to crafting into Snarbolax gear yet. I anticipate the value of those particular Shadow Lair gear going up quite a bit as they are now much more time consuming to craft.
You have gained respect and admiration for all of the washing machines that are out there in the world. Truly a splendid thread.