According to Cambridge Dictionary, "accommodation" can have the sense of 'a special arrangement that is made for a person or group that has different needs to others' – but, according to that same dictionary, this use is typically American. Now I'm wondering to what extent this is true – don't speakers of BrE use "accommodation" in this sense, and if not, what do you use instead; for instance, what would you call a Letter of Accommodation in BrE?
I tend to disagree with the Cambridge dictionary in marking this as exclusively American. I can find examples of this sense used in British writing:
[Pregnancy and maternity discrimination] takes many forms, including [...] refusing to offer reasonable accommodations to help expectant mothers do their jobs. As a pregnant woman or new mum, you must understand your rights ... (source)
Note the British "mum" in this example.
A LOA is the name of a legal document. It is defined in US law. The equivalent in English law would be the EHCP (Education and Health Care Plan) which was previously (before 2014) called a "Statement of Special Educational Needs" - resulting in the rather ugly expression "statemented". Note that these are legal terms and so jurisdiction matters. The law changed in 2014, but the new law only applies to England, not to Wales (which continues to have Statements, not EHCPs) and Scotland is different again, since it has a completely separate education and legal system.
Both Letter of Accommodation and Education and Health Care Plan are proper nouns, and so fixed. You don't adapt proper nouns to dialect.
If you are in another country, the usual approach is to use the name of the document untranslated, with a literal translation for convenience (Eg "Koseki Tohon (family register)" for the legal document in Japan). If you are in a country in which there is no such document, but this is just an informal set of suggests for how to accommodate someone, you can just use descriptive language. This document would likely take the form of a "list" so:
I'll send you a list of the accommodations you should make to support this disabled person.