Can you have a brick which repeatedly explodes every second? (There one second, not there another second)
If so, then you can just make that "100" seconds or "999" seconds and back for one.
Can you have a toggle door which explodes and doesn't come back until you press a button again?
If so, put every brick in the same 'Triggered Group' (I assume you have this, it's a pretty basic feature for such a system) and have them toggled by another brick you place very far out in the terrain/map. Click once, your spam tower is totally invisible.
It wouldn't be to generate these bricks. (General Idea:)
function spamInvisibricks()
{
Go Left
In 100ms: Stop Go Left, Use Bricks (1)
In 500ms: mousefire, mousefire
In 500ms: plant
In 500ms: Use Tools (2, default slot for Wrench)
In 500ms: mousefire, mousefire
In 500ms: commandtoserver('eventset',"24*^HQW" (Randomly generated name),"parameters for a brick which explodes when triggered by Group 'killbricks' ")
In 500ms: close GUI
In 500ms: spamInvisiBricks();
}