Since you went off topic (which is okay) about CRG, just to continue that line of thought…
1) If someone violated CRG by marrying two wives, a) what are the consequences? Is he in a cherem in the standard way as when a B”D places someone in cherem? b) How does he remedy the situation and exit cherem? Must he divorce one of his wives?
2) If he must divorce, can he choose which one?
3) What if both refuse to accept a divorce. Then CRG prohibits him from forcibly divorcing either and he remains married to both. What to do then?