Handling Spare Keys Without Agent or Local Presence

Hi,
I'm trying to think of options for resolving lost key issues in my HMO properties.
I'm taking back management of my rental properties from the current agent. They are HMO properties, so each room has a lock on it.
I don't live in the area, so getting to the property quickly isn't possible.
If a tenant loses their key, they will need another one quickly as they won't have access to their room. Getting into the communal areas won't be a problem as there will be plenty of people around.
What options would you recommend?
Only one I can think of is to install a key safe box for every room in the house in a communal area.
Thanks,
Rob
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