Give keys a place you can find by touch
Choose a place and attachment that work with the shapes of your actual keys.

Lay out the keyring
A compact folding organiser is usually designed around particular key shapes and thicknesses. A long mortice key, a bulky vehicle fob and a small flat key will not necessarily fit the same mechanism. Check compatibility before choosing by the number of keys advertised.
Keep electronic fobs and unusual keys in the arrangement their manufacturers permit. Do not file, drill or alter a key just to fit an organiser. If it has a removable screw or fastener, follow the assembly instructions and check that it is secure before relying on it outside the house.
Consider the complete bundle. A tidy row of keys plus several hanging accessories may be bulkier than the original ring. Remove decorative extras if they interfere with handling rather than buying a larger organiser to accommodate them.
Make the usual key easy to find
Choose a system you can recognise without emptying a bag. A contrasting pouch, a dedicated internal hook or a distinctive permitted key cap may be enough. The aim is to separate the keys from loose objects, not necessarily to enclose them in a complex mechanism.
Try using the key in the intended lock while the organiser is attached, where safe and appropriate. Check that the surrounding body does not hit the door furniture and that you can turn the key comfortably. A compact arrangement in the pocket can still be awkward at the lock.
If attaching keys to a bag, use a suitable internal attachment and keep them accessible without dangling outside. Avoid long loose cords that can catch on objects. Do not attach identifying address information to a bundle simply to make it easier to return if lost.
Keep the routine consistent
Give keys a regular place at home as well as inside the bag. A tray or hook can work if it is suitable and not accessible from outside through a nearby opening. Keep spare keys separately according to your household's security arrangements.
Inspect rings, clips and any organiser fasteners occasionally. A worn clip can undo the benefit of a carefully chosen layout. When adding a new key, reassess the arrangement instead of forcing one more piece into a full mechanism. Ease of use at the door is the test that matters.