Never really worked with broodies other than as a youngster with my father who reared his birds with broodies, as someone said broody was only tethered to nest box when she was let off to clean and feed herself.
When he released birds to the wood Pheasants that is, released in small numbers four to six broods in one spot , and ten or a dozen release points, broody kept in coupe as call bird chicks were free range no release pens as today.
Did not have many partridges, these were mainly left to their own devises, though all roadsides were checked for nests and any found had the eggs replaced by dummy's, the eggs then placed under a broody until they started chipping they were then returned to the partridge nest, as it would be hard to find better parents than the partridge and once hatched will normally not do to badly, the critical time is when the hen is sitting especially by roadsides or tracks, disturbance from roadworkers cutting verges, dog walkers, hunting cats will also work roadsides.
While rearing with broodies in my opinion still produces the best birds, its not really practical today, as a hobby fine but you could not find enough broodies these days to hatch a substantial amount of birds.
I can remember the struggle even in my fathers day scouring the countryside trying to get enough broody hens, and you needed spares because sure as fate some would go off the brood.
Now if you really want to go back to how things used to be, you could start making your own chick food as there was no or very little proprietary food for pheasant chicks available, so the alternatives was to feed chicken feed or make your own as most keepers did, custard powder, fine oatmeal, boiled and minced rabbit, and some closely guarded secret ingredients, a very labour intensive business.
No things were not always better in the good old days