I had a similar issue where miqo wasn’t able to find the ALC recipe for mortar but I managed to figure out a work around. First thing you want to is to find the mythril ingot (armorer) recipe in the crafting log and drag the mythril ingot icon onto your hotbar. Then for your scenario you would paste this:
job(ARM)
solverPreset(fastest)
key(4, 1)
craft(100)
repeatChapter(99)
The only things you would need to change is where the key press is (for this example the mythril ingot icon is on 4, bar 1) and the solver preset depending on if you are doing HQ crafts.