I am looking for ideas,

We do not use a PDM nor SW Revision tables, just a general table to control revisions.

Does anybody have an idea on how to insert a rev triangle into a BOM?

Ex.

One Rev. 1 of the assembly and drawing Part #3 was a 2" Carbon flange.

Revising assembly and drawing to Rev. 2 but changing said flange to Stainless. Dimensionally nothing changes only material and our inventory Item ID #. 

What I'd like is someway to insert a triangle into the BOM highlighting that that line item has been revised.

I know I could insert a separate column but, I'd like to keep the BOM minimal if possible. I can do it into a general table but inserting a symbol into a SW BOM would change the properties of our library part (flange) which I do not want.