Is it possible to use Right Alt on your keyboard for diacritics? I use AltGr for diacritics signs on Czech keyboard, but maybe your language doesn’t support it.
Next way is to use macros like this and define a keyboard shortcut for each macro.
Sub longedE
dim document, dispatcher
document=thisComponent.CurrentController.Frame
dispatcher=createUnoService("com.sun.star.frame.DispatchHelper")
dim args1(0) as new com.sun.star.beans.PropertyValue
args1(0).Name="Text"
args1(0).Value=chr(233) ' or "é"
dispatcher.executeDispatch(document, ".uno:InsertText", "", 0, args1())
End Sub
And also it is possible ot use old Slovak extension, you can run it from menu Tools/ Add-Ons/ Insertion special characters. You can Define own characters, but there is only 25 characters for Insert.
jp_vloz_znaky.oxt.RENAMED.ODT (41.7 kB) → Rename ODT to OXT!!!