How can I suppress sigint-timeout and sigterm-timout options from roslaunch ?

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This question is part of a larger problem. I am trying to run a distributed application. I have upgraded one machine to Lubuntu 20.04/Noetic. The other remains as Lubuntu 16.04/Kinetic. My launch file now fails because the options --sigint-timeout and --sigterm-timeout are added to the command line invocation of roslaunch on the remote machine (running Kinetic). Unfortunately that version does not support these options.

roslaunch midget midget.launch 
... logging to /home/paul/.ros/log/989c153c-7864-11eb-bacf-1ff0df2d0d79/roslaunch-clio-11461.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://clio:39771/
remote[thalia-0] starting roslaunch
remote[thalia-0]: creating ssh connection to thalia:22
launching remote roslaunch child with command: [env ROS_MASTER_URI=http://clio:11311 /home/paul/catkin_ws/devel/env.sh roslaunch -c thalia-0 -u http://clio:39771/ --run_id 989c153c-7864-11eb-bacf-1ff0df2d0d79 --sigint-timeout 15.0 --sigterm-timeout 2.0]
remote[thalia-0]: ssh connection created
remote[thalia-0]: Usage: roslaunch [options] [package] <filename> [arg_name:=value...]
       roslaunch [options] <filename> [<filename>...] [arg_name:=value...]

If <filename> is a single dash ('-'), launch XML is read from standard input.

roslaunch: error: no such option: --sigint-timeout

[thalia-0] killing on exit
RLException: remote roslaunch failed to launch: thalia
The traceback for the exception was written to the log file

Is there any way to suppress these command line arguments ? Is there any chance of ROS Noetic co-operating with ROS Kinetic ?

Installing Noetic on the second machine is not really a option - it would require changing the O/S, ROS and a ton of other installed software.