More Questions than Answers
Need some clarification first. Does your PPL state that you are restricted to Lithuanian comm only (or some other "does not meet ICAO requirements...") statement?
Next question would be, how did you get an "ICAO Level 4?" Was it through an examination with a Lithuanian CAA examiner? Only a licensing CAA, on their own or through their approved 3rd-party tester can do an ICAO language proficiency certification.
And it sounds like the only Lithuanian CAA-approved testing is through this airspeak program.