One of the limitations of the AutoLISP support in AutoCAD LT (2024 and higher) is the missing function which allows creating external objects - (vlax-create-object) (does not work and always returns nil in LT).
For some add-on applications you can circumvent this limitation by invoking the object creation function through the Windows interpreter for Microsoft HTML Applications - MSHTA.
This is e.g. a LISP code which invokes voice output from AutoCAD LT:
(setq sptext "Hello world")
(startapp (strcat "mshta.exe vbscript:close(CreateObject(\"Sapi.SpVoice\").Speak(\"" sptext "\",0))"))
Or better yet - this code copies the given, e.g. generated/computed text to Windows Clipboard in AutoCAD LT:
(setq cltext "Hello world!")
(startapp (strcat "mshta.exe vbscript:close(CreateObject(\"WScript.Shell\").Exec(\"clip\").stdIn.WriteLine(\"" cltext "\"))"))