Gold pickaxe that mines diamonds

HEllo, so basically I'm trying to make a datapack for my soon-to-be mini server that slows down early game progression by introducing ages (Wood->stone->copper->iron->gold->diamond) and I have ready part with bosspar functioning as clock to show age progression and Loot_tables for each era.  There is a problem that golden pickaxe harvest level is the same as wooden pickaxe, making gold complety pointless to use in overworld. I already implemented blockage on diamond ores that doesn't allow iron pickaxe to be used to mine diamonds and I don't know how to make that golden pickaxe work,,rest of the datapack I think I can manage on my own (for now). Help appreciated