As to the original question, I don't think it will work..... at least not peacefully. They might settle down, but I don't think they will because you are introducing new birds. I think the possibility for conflict is very high, and I think the number of roosters will stress your hens quite a bit.
Even if you free range all day, they all will come back to the coop at night, and in the winter, with it getting dark so early, they are kind of artificially confined close together for long hours, mine are housed up for about 16 hours per day. I don't lock them in, it is just that when it gets dark, they head in, and are close together, which can cause lots of problems with chickens.
Roosters raised together, often times with enough space, lucky with the genetics and the stars lined up, get along. They tend to work out the pecking order, and with enough space get along..... but sometime will get pretty violent with each other, even having been raised together. Currently I have two, who were raised together...... I plan to keep just one for the winter, almost have my mind made up. I don't have the size of flock you do, and my flock will be happier with just one rooster.
If you have them were they can see each other, that is really a separation, not a quarantine. Not a biggy, just a definition, that many people on here use incorrectly. To quarantine, you need to separate the flocks by a large distance, and keep your clothing, shoes and feed separate too. Many people separate the birds with a fence, which might help with introductions, but does nothing about disease transmission.
It will be interesting to see how it goes, give us an update....personally, I think that is too many strange roosters for that many hens, it might be far from peaceful, might be pretty bloody.