Mask/Charset - Try 1 More Character?

[l008com]

I'm trying to bruteforce a slow hash using the following charset:

Code:

?l?u?d!@

So 0-9, a-z ,A-Z, plus the symbols ! and @
I'm using the mask:

Code:

?1?1?1?1?1

Let's say I finish that and find nothing. Then my client comes back to me and says

you know, there might have been a question mark in there too

Is there a way I can do a charset/mask combo that will basically test the full bruteforce charset of 5 characters of [0-9a-zA-Z!@?]{5} *BUT* only the ones in there that include a question mark. At least one question mark is required, but in any position. Is that something you can do, or would I have to use a script to make my own filtered wordlist and then just feed the wordlist into hashcat? 

Note that I don't want to re-try everything with ?l?u?d!@? and ?1?!?!?!?! because it is a slow hash and that will take several extra days.