rageblade build path
this two could merge to create an item that give 5 as per stack up to 25. and up to 35 ap so plus 2 ap per stack.
so while you lose 15 flat as you gain 5 as per auto up to 5 times. so starting from 0 merely triggering two spells and getting that first auto off should be enough to reach 15 as. hardly a compromise
you keep the flat ap however. so 20 plus 3*5 = 35.
finally combine with 
this way if rageblade if my only attack speed item on say Shen i can get hybrid pen marks instead of as. since ill need the as to help me farm early game. on current rageblade the as doesnt kick in until completed