I use MYTS-8 which you will find in the thread:
https://www.mobileread.com/forums/sho...d.php?t=154500
Its lighter than all the alternatives I tried as all it does is be a terminal.
If you are using it from the framework, you need KUAL, KITE, Launchpad or similar to invoke it but it can also be invoked from a script. Its multi-session and you can leave a session then re-attach to any open session.