Noita seed changer script made in Python. If you want to use it then just install Python 3.6 or higher and set important variables inside the script. Then just run and that's it.

noita_seed.py

import os
import shutil
import subprocess

LOCAL_DIR = 'SPECIFY LOCAL DIR HERE' # your local dir noita path (f.e. %userprofile%\AppData\LocalLow\Nolla_Games_Noita\save00)
NOITA_DIR = 'SPECIFY NOITA DIR HERE' # your noita's game directory that contains noita.exe


def del_file_if_exists(path):
	if os.path.exists(path):
		os.remove(path)

def del_dir_if_exists(path):
	if os.path.exists(path):
		shutil.rmtree(path)


def remove_files():
	del_dir_if_exists(LOCAL_DIR + '/world')
	del_file_if_exists(LOCAL_DIR + '/mod_config.xml')
	del_file_if_exists(LOCAL_DIR + '/mod_settings.bin')
	del_file_if_exists(LOCAL_DIR + '/player.xml')
	del_file_if_exists(LOCAL_DIR + '/session_numbers.salakieli')
	del_file_if_exists(LOCAL_DIR + '/world_state.xml')

def make_seed_file(seed: str):
	with open(NOITA_DIR + '/magic.txt', 'w') as f:
		f.write(
f'''<MagicNumbers
WORLD_SEED="{seed}"
_DEBUG_DONT_LOAD_OTHER_MAGIC_NUMBERS="1"
_DEBUG_DONT_SAVE_MAGIC_NUMBERS="1" >
</MagicNumbers>
		''')


if __name__ == "__main__":
	print("SEED: ")
	seed = input()
	if seed != '' and seed.isdigit():
		remove_files()
		make_seed_file(seed)
		os.chdir(NOITA_DIR)
		subprocess.call(['noita.exe', '-no_logo_splashes', '-magic_numbers', 'magic.txt'])
	else:
		print("BAD SEED!")