Just a heads up @OneWolfe... Found those two vanilla buckets in the ruin you see in the screenshot. also vanilla eggs and 2 vanilla iron shovels.
Also... you might want to go through and take a look the recipies that require vanilla buckets. There's only a handful, but some (like the logi pipes fluid container supplier) can't be crafted without a vanilla iron bucket. I don't think any of the recipes warrant the need of red steel buckets (except for maybe the jerrycan from immersive engineering, or disable it completely)
IMO, i'd say the sprinkler(Cogs of the machine) bucket could be replaced with a double iron or steel sheet, not sure if it has any functionality though. the airlock (magneticraft) could be an openblocks sponge (which would need the vanilla wool replaced) with some of the glass replaced with iron+ sheets/double sheets.
Your pack, your call. Some of the bucket requiring recipes i can see not fitting your vision of the pack. But definitely the logi fluid container supplier should be fixed.
Also... idk if it's cause my power gen is horrid... but some (read: most) of the carpenter recipes not standard to forestry take an excessively long amount of time and RESET PROGRESS IF THE CHUNK IS UNLOADED!!! Imagine my frustration when going to make the brass pistons for my airship helm, only to go mining and come back to see my 3/4 progress on the first one reset to 0. Not sure if the intent was to make the recipes take a lot of power or a long time to craft, but it forces you to babysit the machine until it's done... which inhibits gameplay ALOT.