The OF ad orientem in Latin would differ from the EF in many significant ways.
In that OF,
- the priest would say the same prayers out loud that he does in your vernacular OF. Much, much more would be audible in this type of OF than the EF.
- the people would respond as they do now in the OF, only in Latin
- a layperson would read the readings in the vernacular, from the current OF lectionary
- the priest would actually be facing the people quite often (more often than the EF)–from the presider chair, and when directed by the rubrics at other times.
- communion would not be required on kneeling and on the tongue (depending on the local rules, of course)(as it is in the EF)
- altar servers need not be of the masculine persuasion (depending on the local rules, of course) (as they are in the EF)
I’m not sure I get your question about the liturgy of the word and the altar.
The servers would most certainly not be the only ones responding in this OF Mass. The people have the same responses in this OF Mass as in any other OF Mass.
By the way, I’ve been to this type of OF Mass–Latin, ad orientem. It is absolutely heavenly. I much much prefer it to the EF, mostly because I can hear what is going on, I know what the priest is doing, I don’t have to guess when the consecration happens. And I love the EF.
The OF Mass, ad orientem, in Latin, is more like your reverent OF Mass in the vernacular than it is like the EF Mass.