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. I suggest that you contact Dawson precision as the are the BEST handgun sights experts around Call Toll Free: (866) 300-1911 in fact they sell co-witness sights for the 320 https://dawsonprecision.com/sight-set-sig-p320-m17-co-witness-black-rear-and-fiber-optic-front-by-dawson-precision/
I've always been told you shouldn't slave the dot to the irons, meaning not to try adjust the elevation down to where it is a perfect cowitness with the front site, it busy up your field of view and makes acquiring the dot slower, plus because a reddot is single point of aim ots going to project out to ranges different then irons which are 2point aiming. If your just talking about having your irons as a back up in case the electronics fail, then there is a notch in the rear of the romeo 1 that you use as your rear site and you should be able to see your front site post through this notch. There are a couple youtube channels I watch for optics info and Aaron at sage dynamics is by far one of the best Here's his video on the Romeo 1 https://youtu.be/shdhVPc3Ivg
James, the easiest thing would be the suppressor height front sight. Cheers and stay safe!