Honestly, these changes are dumb.
If the "0 cs" top lane strategy work because of the spellthief + Klepto synergy, just hit Klepto which is generally NOT used by supports (except Sona which yet has other good runes available for her)
Klepto basically allow you to get 10 gold every 10 seconds through two autoattacks (so 5 gold for AA).
Just reduce the amount of gold you get from Klepto to something like 3 gold for AA, so you get 6 gold every 10 seconds. If you think that's too much of a nerf, add also a +1 gold if the Klepto AA kill a minion, so you lose gold if you use those on minions but you are still encourage to not only harass with Klepto
Problem solved, Klepto still give you a sizable amount of money, but you can't abose the passive gold gen to just freely harass without worrying about CSing