What would the problem be in having them all together? I suppose you would have to separate them again if you were selling the hoggs, which would be significant with large numbers.
We no longer keep large numbers of sheep, just a small flock. We have always run our ewe hoggs together with the other females and lambs, including during lambing. This gives the last years lambs experience of what happens at lambing, and what mothering a lamb is about, before they have to do it for real. It does make a difference I believe.
We keep all our males, including tup lambs from 4 1/2 months, together in a field across the road, which keeps them well separated.
Sheep have a natural need to live in family groups, so keeping last year's lambs plus this year's lambs together with their dams keeps them settled.