That's why you need a broker with inline risk checks
You have to pay quite a bit more for redistribution,"Can retail brokerages like Schwab provide this service for a small mom and pop retails like me?"
As you are coming off the old oX Smart you will route off the private feed of whoever is programmed into smart. New SIPs are simply a proposal now and you would always see the SIP as a quote - as has been pointed out anyone who routes of the SIP is a dinosaur.
FINRA 2090 - know your customers - pretty much means DMA in securities is sort of a fantasy.
The ability to redistribute the exchange "private feed" and put it on your machine I'm really not sure of. Unlike the SIP I believe the private feed doesn't allow redistribution for free, but it's been a while since I've been on the sell-side. I'll pull some contracts and look, but my best guess is no.