Both inevitable and ineluctable are words in the dictionary that mean something is impossible to avoid.
So do we use them in a same or different context?
Learn English – the difference between ‘inevitable’ and ‘ineluctable’
vocabulary
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Inside may be used while describing position/location as opposed to outside. Example: The box is blue colored inside and black outside.
Within may be used for time/space. Example: I'll reach there within ten minutes. Stay within the boundaries.
Probably the most important difference is that through is used with an action or process, not with the agent who actually performs the action. (You may, however, effect something through an intermediary). By may be used with both.
The data were collected through a telephone poll of residents.
The data were collected by a telephone poll of residents.
∗The role of Hamlet was performed through Olivier.
The role of Hamlet was performed by Olivier.
By is far more common. As you may see from the Google Ngram below on a handful of random verbs, through appears to be getting more popular, but for most verbs it's used less than 5% as often as by. Note, however, that for a couple of verbs the percentage is significantly higher. These verbs are achieved and accomplished, which are inherently more "processual" than the others.
Most of the time, by is just fine. There is certainly no reason to avoid it; on the contrary, the sort of Elegant Variation you describe is almost universally deprecated. But when you're dealing with processes, it's OK to use "through".
Best Answer
The biggest differences are frequency and register:
Prioritization is very important in language learning. Inevitable is a much more important word for most learners to know. There are native speakers who don't know what ineluctable means.
In terms of meaning, there's a lot of overlap, and I think you could often use either word without a change in meaning. But I think ineluctable is often closer in meaning to inescapable, and tends to be used figuratively for inescapable conclusions, facts we can't avoid acknowledging, and so forth.