Removing Player Pings, Pinging With Triggers

Problem
I need to remove alt-g and alt-click pinging because I want to add an ability that pings. This is to a) reduce ping spam and (more importantly) b) to add an element of mystery to the map.
The map goes along the lines of Dark Deeds / Who is the Killer.

Current Progress
In Advanced>Game Interface, I managed to remove player pings. However, triggered pings no longer work. This includes Simple, Flashy and Warning pings of various RGB.

Alternative Solutions
Reveal location, make invisible gold mine or neutral building (for minimap icon) and remove it later.
Would work well, but then players would have to pay close attention to the minimap to see pings.
So yeah, I need to find a way to ping using triggers.