You say you live in EU, so is your keyboard ISO (big enter key, small left shift, '><|' key next to left shift) ? If so, probably your best bet is to find a used Cherry G80 or G81 from Germany (Cherry profile thick doubleshot ABS keycaps in ISO layout) on ebay. Be careful, though, since some of them have weird layouts, so look out for ones that have the same layout as your MJ2.
The 3000 and 8113 should have the right caps, but 11900 and 1800 have smaller modifiers and short right shift key. The G80 series has MX switches, the G81 series has MY switches. On both of those series' the keycaps are MX compatible. G82 and G83 are not MX compatible.
Or you may find a few Cherry profile ISO sets in the GH classifieds.