What is the correct way to get established on the outbound track on this approach?
I do not have a specific ICAO reference. By my interpretation of the chart, you can approach the airport at any assigned altitude above 2300 feet MSL from your specified East direction. Just as long as your aircraft stays between the 71° radial clockwise to the 215° radial of the VOR. But, you would have to be above 4900 MSL to intercept any part of the instrument approach. Once you are established on the approach, you can drop down to the appropriate designated at-or-above altitude marked on the approach. If you are joining the approach at the LCA VOR, you would enter the hold, either climbing or descending until you reach an altitude where you can safely descend down to 1500 feet MSL during the teardrop course reversal. Remember, you have to remain at or above 4000 feet MSL until passing the VOR when leaving the hold. This will be your Minimum Holding Altitude as well as your Minimum Crossing Altitude at the LCA VOR.
If you have already been cleared for the procedure at LCA, you would just have to make your radio call once you reach the VOR for the hold, and again at the VOR when you leave the hold (if one is necessary to gain/lose altitude).