The easiest way to do this is to create a new session type. Open a konsole window, and under Settings->Configure Konsole, create a new session type. Name it "AIX" or something, add your telnet options to the "Execute" section, tweek the schema and other settings, then save it. It will be saved to ~/.kde/share/apps/konsole/<type name>.desktop. Now, you can start a new konsole by typing "konsole --type AIX". It will launch a new console with those base settings. If you want to do further tweeks to the windows size, add more session tabs, etc, do so, then go to the Settings->Save Sessions Profile menu option, and save the profile (ex: MyAIX). Now you can reproduce that exact profile with "konsole --profile MyAIX". This is saved under ~/.kde/share/apps/konsole/profiles/MyAIX.
If you want all users to have these settings available by default, you can copy them to /usr/share/apps/konsole/ & /usr/share/apps/konsole/profiles accordingly. If you don't want these avalable to all users, then you will need to copy them by hand to each users home directory (see above paths).
Personally, I'd recommend using ssh instead of telnet. It's more secure and it's available for aix, and it encrypts the data packets. You could get the users passwords by running tcpdump otherwise.