So, here is what I would do. For now...nothing.
The same leaks that tricked out about the Fenix 7 and EPIX are trickling out about the 955 now. There is less information but so far it is apparent that the 955 will be LTE, either entirely or with an LTE option. Before dropping that kind of money I'd wait to see what is announced for the 955 and then take a look at the Fenix, Epix, 945LTE, and 955LTE to see which one gives you what you need. If nothing else the introduction of a 955 should lower the price of the 945 or flood the market with used 945s being replaced by one of the three new watches. Whichever I buy will free up a 945 (non LTE) in need of a good home and I won't be the only one in that boat.
The Fenix will have better battery life than the EPIX so the one use case that it makes more sense, outside of cost savings, is for those longer events. Lastly, if the tracking without a phone is the top priority take a look at pairing
inReach with Gramin for even more tracking options than using an LTE enabled device. It may be overkill but it doesn't hurt to look at it as an option when deciding between alternatives.