All 147 organisations offers basic training.
That's quite wrong. Not all Pt 147-approved organisations offer Basic training. At least some only offer B1 and B2 type-rating training.
And I'm not so sure about finding a list of Part 147 approvals world-wide on the EASA site, but if you can supply a link to that I'll eat my words and apologise.....
There's a list of UK approvals issued by the CAA, and perhaps other NAAs do the same. Maybe there are approvals
outside EASA-land, just like there are Pt 145 approvals out there; if so EASA would oversee those, and perhaps provide a list on its site. Is that what you are referring to?