Thoughts on the gold item changes:

It makes a lot more sense for the new bonus gold and mana restore on kills/assists to be on the Spell Thief charged passive rather than movement speed (not sure what supports like Brand, Annie, Zyra, Veigar, etc will do with the movement speed once they are already in range with their attacks and abilities, they would rather have the extra gold and mana restore for being aggressive; kind of gives them a discount morellos passive that way).

Coin changes seem pretty good, need to play with them.

It may be better to have all the upgraded passives to be similar to each other. Relic line when upgraded instead of the shield that restores when out of combat could heal and give gold on kills/assists, and the other two being gold and mana on kills/assists; this way it makes a good transition between laning phase to teamfights and skirmishes. Plus support-tanks should have more of an emphasis on peeling for their backline rather than engaging so the shield is weird in that regard even though it makes sense for engaging tanks, but the role should be about peeling and protecting and to do that you need to be alive so a heal+gold makes sense, where as coin and spell thief will be mostly bought on ranged champions (and sometimes coin on melees, but that is the exception than the norm).

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Early skill point may be too hard to balance, it is worth testing out on LIVE, but I definitely see the player base potentially abusing this function to the extreme and would just be removed - we will see though.