[chrony-users] Chrony and raw DCF receivers?

[V10lator <v10lator@xxxxxxxx>]

Hi,
I wanted to setup my own stratum 1 NTP server, so I wired a raw DCF77 
receiver (127.127.8.0 mode 5 or 127.127.8.0 mode 6 with ntpd) to a SBC and 
tested a bit with ntpd. After some time I decided to give chrony a try as 
ntpd had too much shortcomings.

Now chronyc is a complete show stopper as I can't find a way to tell it to 
read the DCF77 signal. There are only options for PPS (GPS receivers, I 
think). SHM also is no option as the only thing usable with this is 
radioclk but that seems to be for ntpd only:

$ apt-get install radioclk
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer 
required:
 libtomcrypt0 libtommath0 timelimit
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
 ntp
Suggested packages:
 ntp-doc apparmor
The following packages will be REMOVED:
 chrony
The following NEW packages will be installed:
 ntp radioclk
0 upgraded, 2 newly installed, 1 to remove and 0 not upgraded.
Need to get 20.4 kB/485 kB of archives.
After this operation, 910 kB of additional disk space will be used.

So how to use chrony with a raw DCF77 receiver? There doesn't seem to be 
any info on the net other than

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