This is my order of preference (in descending order):
FD01
FDX1
FD02
As long as you're willing to get a pair of sharp tipped tweezers (or a large sewing needle) and a disposable, pre-moistened alcohol pad/towelette, the FD01 is cheaper (when Drop has them available) than the FDX1 and has the three different tips (Stainless steel, Bronze, Titanium). The FDX1's tips are all of the stainless steel variant; it's debatable as to the merits of the different materials, but better to have, than to not.
That being said, the JVC HA-FDX1 is available again,
https://drop.com/buy/drop-jvc-ha-fdx1-dual-carbon-iem
You'll have to go through the purchase process, to see if Romania is on the shipping list for Drop.
@surfgeorge is the resident tweeker, for the FD02; I'll leave it to him, to grade the degree of difficulty, in lifting the screen, to add a filter. As the FD02 doesn't come with interchangeable tips.