That said, its still a prohibitively expensive endeavor for most of Disk 1 since you're still barely wining single digits of Fol from fights around then and you actually have to go set up Workshops and hire inventors (or invent something yourself) before they invent something really good and force you to pay extra royalties on it.
Map completion bunnies + the knights in front of Airyglyph that you aren't supposed to win against.
Basically, on a 4D playthrough, the moment you get out of Airyglyph , you go complete the next 2 maps for the bunnies, use those to buy a Holy Sword sneaking back into Airyglyph. Use your uber sword that you really shouldn't have to level up on the knights and get some nice money (gotta win without ever getting hit though because they will wreck your shit in one hit).
With the levels from the high XP knights and the Holy Sword, you can trail 'easily' all the way to the item creation town.
Once there, stack your sword with +100 attack 8 times.
Eventually, after the ruins of Barr, go back to buy weapons in Airyglyph for everyone, ignore the story and go get the stone in the desert, hire Misty Lear and you will have enough money to get one of the weapons with 7 orialchums (I usually go Nel because she's great at MP killing with Flying Guillotine)