Noob Question - Premixed Cocktail Shelf-life?

I'm just wondering what folks opinions are on batch mixing up cocktails like negronis or martinis and keeping them in the fridge (or freezer in the case of the martini) in a sealed vessel. I guess my main question here is, will the vermouth degrade or change character or will the high proof of the gin help preserve it? I know that vermouth once opened is only good in the fridge for a few months (at best).

Further to this, would the taste of the cocktail change as a whole if it is not consumed within a certain amount of time?

I bought some Carpano Antica for negronis from a restaurant here at a hefty premium ($30 CAD each for 2 x 375 ml bottle- I know , crazy) since it is not available at any of Ontario's state-run liquor monopoly stores. Since I'm trying to watch my consumption (diet), I am worried about this vermouth going off before I have the chance to drink it all and if maybe it is actually better to mix a batch based on the assumption of the proof of the cocktail as a whole keeping better than just an open bottle of vermouth to mix on demand.

I might have a negroni now every two or three weeks, so the idea was, make the batch and store it in the fridge in something like this: https://www.amazon.ca/dp/B010POD138/?coliid=I3AW81TQTLBQSY&colid=YK2X8NIZ9FWC&psc=1&ref_=lv_ov_lig_dp_it

Maybe I'm putting too much thought into this lol. I just don't want to waste the expensive Antica vermouth.

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