There's also Hypercerebrix drug (70 biology) that increased 2 INT, obtainable somewhere in Expedition.
Under Pie that increased all stats by 3, useful for few Treshold encounter, such as Social skill and 1-2 very high requirement lock/hack, somewhat uncommon to find, though.
After certain point in the game, you'll get your very own House that you can upgrade with crafting bench, adding 15% bonus to your crafting skills
As for planning, on the Builder site, there's "extra" option on Base screen, which you could check for Crafting bonus, add 2 INT and underpie food buff
Keep in mind that all option will be cuts off once you're in DC, unless you could stockpile hundreds of Hypercerebrix and underpie.
Also for huge QoL, I recommend using either/both Speedhack (someone made small app that seamlessly works with the game) to speed up all animation and walking speed, and Cheat Engine for unlimited weight (Table is available on steam FAQ, or just Google around for more cheaty table)