This is somewhat related to my recent "Let's Talk About Chapter 9 of the DMG" thread, and informed by a recent playtest I did of Five Torches Deep (which is an OSRification of 5e). Going back and forth and thinking about things, what I decided is that I want to create the game I want to run out of 5e using optional rules, house rules, 3rd part supplements and bits and bobs from other games.
So first, let me describe the game I want to run:
The aesthetic is relatively gritty and "realistic" in the sense that Game of Thrones or Lord of the Rings or Abercrombie's worlds are: people need to eat, they get tired, wounds hurt and while fantastical elements exist and may even be prominent and powerful, they aren't common.
The play loop I want is a cycle of: wilderness exploration to the adventuring sight (moderate peril); exploration and problem solving at the adventuring site (high peril); return to the relative safety of civilization where character development and interaction with the world takes precedence (low peril). I use the term "peril" because I don't necessarily mean "deadliness" although that might be included; it is more about lasting negative consequences, from injury to disease to magic curses to losing what one cares about.
Although this main loop is episodic, it should support characters growing over time, discovering more, exploring farther and gaining competence, without necessarily significantly transforming over time (becoming superheroes).Long term stories should emerge from this sort of play and be largely informed by the interactions in civilization based on events that occurred out in the wild or in the dungeons.
Now, I know some folks are going to say "Use something besides 5E" and that is a totally fine suggestion, except that I WANT to use a modified 5E for this. I think Zweihander is likely a good fit for all the above, but I don't want to have to learn and master a whole new system and have to convince players to do the same (not to mention the monetary cost of everyone coming on board for a new game).
So, with all the above presented, what comes to mind for optional rules, house rules, bits stolen from other games, etc... to get 5E where I want it to be?
Thanks.