Requires Unofficial Skyrim Special Edition Patch (has some ingot and leather recipes)
STEP 1: Install mod
STEP 1A: Use a mod installer. Any common one should work fine I'd think. If it doesn't see steps 1a - 1d.
OR
STEP 1a: Download this mod
STEP 1b: Open the zip file you just downloaded
STEP 1c: Find your Skyrim Special Edition folder
STEP 1d: Extract the data folder from the zip file there.
STEP 2a: Smelt Ingots
STEP 2a: Walk over to smelter
STEP 2b: Press the button to "batch craft"
STEP 2c: Enjoy all the extra time you have to do other things.
STEP 3a: Process hides
STEP 2a: Walk over to a tanning rack
STEP 2b: Press the button to "batch craft"
STEP 2c: Enjoy all the extra time you have to do other things.

COMPATIBILITY: This should work with any/all mods I can think of. I can't actually think of anything that it'd break or be broken by.

KNOWN ISSUES: (see bugs for more detail)
- while a (large) batch craft is in progress you can re-activate the station and start another, giving extra materials
workaround: When you hit batch craft wait for it to finish. Unless you have a huge stockpile it's unlikely you'll even see this.

TECHNICAL:
Creation kit prefix: "modBC_"
Source is in the main zip file download in the "Batch Crafting - Source" folder. You're free to use/look at it (it's commented just for that), but if you end up using it (redistribution, slightly edited versions, and dependent works are my main concern because of versioning, derivative works not so much.) I ask you credit me and/or link to this mod. Place the .psc in the usual place (Data/Source/Scripts)
If you want to add recipes to the mod you should be able to add the recipe for the object to the form list "modBC_Recipes" and it should be good to go.
Crafting order:
Smelter:
RecipeIngotCorundum
RecipeIngotDwarvenScrapBent
RecipeIngotDwarvenScrapLarge
RecipeIngotDwarvenScrapLarge02
RecipeIngotDwarvenScrapLarge03
RecipeIngotDwarvenScrapPlateMetalLarge
RecipeIngotDwarvenScrapPlateMetalSmall
RecipeIngotEbony
RecipeIngotGold
RecipeIngotIron
RecipeIngotMalachite 
RecipeIngotMoonstone
RecipeIngotOrichalcum
RecipeIngotQuicksilver
RecipeIngotSilver
RecipeIngotSteel
USKPRecipeIngotDwarvenScrapMetal

Tanning:
DLC1RecipeLeatherValeDeerHide 
DLC1RecipeLeatherValeSabreCatHide [COBJ:02014636]
RecipeLeatherBearCaveHide [COBJ:000EB0AE]
RecipeLeatherBearHide [COBJ:000EB0AD]
RecipeLeatherBearSnowHide [COBJ:000EB0AF]
RecipeLeatherCowHide [COBJ:00078B48]
RecipeLeatherDeerHide [COBJ:00078B49]
RecipeLeatherDeerHide02 [COBJ:001033DE]
RecipeLeatherFoxHide [COBJ:0010CC6B]
RecipeLeatherFoxSnowHide [COBJ:0010D159]
RecipeLeatherGoatHide [COBJ:0007866B]
RecipeLeatherHorseHide [COBJ:000EB0B2]
RecipeLeatherIceWolfHide [COBJ:000EB0AC]
RecipeLeatherSabrecatHide [COBJ:000EB0B0]
RecipeLeatherSabrecatSnowHide [COBJ:000EB0B1]
RecipeLeatherWolfHide [COBJ:00078B54]
USLEEPRecipeLeatherElkPelt [COBJ:050FDA99]
USLEEPRecipeLeatherWerewolfHide [COBJ:05033220]