screen hardstatus alwayslastline with sysctl command

Hello, 

I work with screen.

it is possible to integrate the command
$(/sbin/sysctl dev.cpu.0.temperature)
or (better)
$(/sbin/sysctl dev.cpu.0.temperature | cut -d ' ' -f 2 )
into the screen programm into 
hardstatus alwayslastline? 

Now my line is:
hardstatus alwayslastline "%{= RY}%H %{BW}%l %{Gb}%Y-%m-%d %c%="
it works fine.

(1)
"%{= kw}CPU Temp: %{G}$(/bin/sh -c '/sbin/sysctl dev.cpu.0.temperature')"
doesn't work.
it prints the command string $(...)

(2)
"%{= RY}%H %{BW}%l %{Gb}%Y-%m-%d %c%{BW}$(/sbin/sysctl dev.cpu.0.temperature)%="
doesn't work.

(3)
"%{= RY}%H %{BW}%l %{Gb}%Y-%m-%d %c%{BW}$(cat
/home/ft/skripte/cronjobs/tempft_screen.log)%="
doesn't work.
 
the following command from (3) works:
(filecontent with current temperature)
cat /home/ft/skripte/cronjobs/tempft_screen.log
62,1

Have someone an idea to intgrate the sysctl command into the hardstatus?

Franz