Add recipes for the tier 3 altar that will permit various changes to a greensteel weapon, such as changing the attack mod from str to dex or int, or doing the same for the damage mod.
For example: To change a melee weapon from Str attack mod to Int, you would need a Shard of Power enchanted with the +6 intel effect, a Mystical Plant (aka broccoli), LDS, Large Horn (just to give those use beyond occasional blank crafting), and of course the Large Energy Cell
So, to make the change, you would first have to use a tier 1 altar to craft the +6 intel shard, then combine that with the other stuff in the tier 3 altar to change your GS melee weapon to Intel for attack, and leave Str for damage.
With another recipe, you could change the damage mod to a different stat as well.
Might be interesting for those players who go max con to make a weapon that uses their con stat for attack and damage, or permit a FvS who built as more of a caster to have a weapon based off Wis. Give those arcanes who like to build a Spellblade an option to enhance their build. Etc and so on.