The 7-bolt block's already run oil squirter's, they just aren't as easily identified as the 6-bolt blocks squirter's are. Here is a picture of the location of the 7-bolt oil squirter's, the blocks been cut away a bit to make them easier to spot. The A
is pointing to their location, and the pictures following that show that the oil squirter itself looks like.
So, now that you know the above (if you didn't already), Magnus Motorsports actually machines their 7-bolts to except 1g oil squirter's. It sounds like you're trying to keep cost down, which you won't be doing if you send your block to Magnus, but here's the read from their webpage.
Magnus Motorsports - Crankwalk Theory
I hope I was able to help you, or at least got you pointed in the right direction.