IIRC Loglan vocabulary had a large element of Mandarin Chinese, and so Lojban too ? This seemed both uselessly idealistic and absurdly user-hostile. I would think that a conlang targeted at global appeal would be based on some combination of Romance languages and Germanic languages, perhaps an ur-version of each (like, Latin and Icelandic). Such a process might bring you a result where the vocabulary was as accessibl…
So for example, here in Alaska, Athabaskan languages are mostly dead, Yupik and Inupiaq is still around but English is predominant pretty much everywhere except west Alaska and the occasional community. Sugpiaq and Alutiiq are basically gone, Tlingit has a revival but it’s not around, Eyak is dead, etc.
Why don’t we create a blended conlang that can take pieces of each of these languages in the form of vocabulary and grammar - even though they’re very different grammatically and in terms of lexicon, we can make a language that is relatively easy for people to learn because it’s regular, substantially different than English so it’s not “colonizer-tongue” and largely unique to the geography of the place.
You could do the same thing in Europe to create lingua-francas.