You can get higher than +75 overall if you use FoTA (halves cost after the normal additive discounts from unit and hammers), and use weird setups like 4-armed forgers, but 75% off is theoretically spammable by Ulm -- Master Smith, Dwarven Hammer (+50 total and FoTA halves the remaining cost. No Steel Ovens or artifacts required).
At least it'd be nowhere near as abusable than the Alchemist + Runemaster combo from MoM.
