Well the new circuit above works just fine. Component values as shown are good and a C1 of 4,7uF gives about 1/2 to 1 second buffer, or delay. 22uF increases the delay to about 4 seconds, and 47uF to about 7 seconds. So this board provides pos to neg trigger inverting, anti-chatter, and fixed delay by changing C1, all in one.
If anti-chatter or delay is not needed for some reason, you only need omit R5 and C1, and jumper the pads for R5. Very straightforward. The pos trigger signal will still invert to neg just fine. 
Here is the board layout:
Rod
