I have a good plan and it will be installed later this week.
In Finland there is only one lock vendor called Abloy. As they say on their web pages -- "million choices - One cylinder". What that means is that it's really easy just change current physical lock with the one that is battery operated and has radio controller remote.
I'm going to use Abloy model EC101 as a lock. It has following features
- No modifications to standard Finnish door -- Replaces old lock
- Battery will last for 1,5 year
- Old key works as a backup
- Wireless control by using remote controller EC501
How about connecting Yubikey, PC and Abloy Remote together? Stay tuned...