There is another solution:
The connected safe.
https://www.ikeyp.com/products-features/ikeyp-bolt/This is not a simple MasterLock type box which is connected by Bluetooth to your smartphone but a real digital safe connected by Wifi.
You can then give total control of your safe to your KH who will control everything from his/her smartphone (warning, it must be a trusted KH).
Your KH will be able to change the code of your safe whenever it wants.
Of course, as for all safes there is a security key but your KH will be automatically informed of any opening of the safe.
Unfortunately, this company only delivers in the North of the American continent (USA and Canada) but today there are companies specializing in parcel forwarding that provide you with a delivery address in the USA such as "Shipito" for example and re-ship the parcel to your home (obviously this is a paid service and you will have to pay additional customs fees but when you love you don't count).
I like this idea even if it is a bit expensive.