Help using --increment in the middle of a text file

[xkwas]

Hi there!
I'm a little new with rules... I am wondering how can I insert four digits after the 6th symbol of the word 

ignorediddy would be the dictionary word  and then insert the whole keyspace 0001-9999 after the 6th character
ignore0001diddy 
...
ignore9999diddy etc. 

also, will it work in Straight (-a 0) mode?
In other words, what would the command be like?
Thanks!