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Sharing more links... this macrumors post may help to figure out how much RAM one needs.
https://forums.macrumors.com/threads/how-much-ram-do-i-need-in-my-macbook.1756865/
As the RAM questionnaire was done a few years ago, there is the suggestion that you should add '7' to your score to get a more accurate answer for up to date OS etc. It seems to work OK as a guide to me.
@Dammit, for what you want, the cheapest based model MBP is more than enough. Any yes, even customised specs Macs can be returned within 14 days, no questions asked. I have done it a couple of times.