Code to use CircuitPython over WiFi. Very rough around the edges, but seems to work pretty well

code.py

import storage
import adafruit_requests as requests

import networkInit  # Board specific network connection

try:
    from secrets import secrets
    connectionString = secrets["ota_connection_string"]
except (ImportError, KeyError):
    print("Connection string is kept in secrets.py, please add it there!")
    print("For example: 'ota_connection_string' : 'http://192.168.0.20:8000/',")
    raise

try:
    # Get the list of files to download
    # Server must contain files.json
    # Formated like: {"files": ["<file1>", "<file2>"]}
    response = requests.get(connectionString + 'files.json')
    if "content-length" not in response.headers or response.headers["content-length"] == 0:
        raise RuntimeError("files.json not found on server")
    fileList = response.json()["files"]

    # Make sure the file system is writable, then download the files
    storage.remount("/")
    print("Downloading files")
    for filename in fileList:
        try:
            response = requests.get(connectionString + filename)
            if "content-length" not in response.headers or response.headers["content-length"] == 0:
                raise RuntimeError("File not found")
            text = response.text
            with open(filename, "rw") as file:
                file.write(text)
        except:
            print("File: " + filename + " failed to download")
            continue
except (ValueError, RuntimeError) as e:
    # Could not download files, continue to run program.py
    print("Could not download files")
    print(e)
    pass

print("Running program.py")
__import__("program")

networkInit.py

import board
import busio
import neopixel
from digitalio import DigitalInOut
from adafruit_esp32spi import adafruit_esp32spi
import adafruit_esp32spi.adafruit_esp32spi_wifimanager as wifimanager

# Get wifi details and more from a secrets.py file
try:
    from secrets import secrets
except ImportError:
    print("WiFi secrets are kept in secrets.py, please add them there!")
    raise

status_light = neopixel.NeoPixel(
    board.D4, 1, brightness=0.2
)

esp32_cs = DigitalInOut(board.D10)
esp32_ready = DigitalInOut(board.D9)
esp32_reset = DigitalInOut(board.D6)

spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
esp = adafruit_esp32spi.ESP_SPIcontrol(
    spi, esp32_cs, esp32_ready, esp32_reset
)  # pylint: disable=line-too-long

if not esp.is_connected:
    wifi = wifimanager.ESPSPI_WiFiManager(esp, secrets, status_light)
    wifi.connect()

udp.py

from networkInit import esp # Board specific network connection
import adafruit_esp32spi.adafruit_esp32spi_socket as socket

# Override socket.send to support UDP
class UDPSocket(socket.socket):
    def send(self, data):  # pylint: disable=no-self-use
        """Send some data to the socket"""
        # socket_open is needed to start a new message
        socket._the_interface.socket_open(self._socknum, bytearray(b"\xff\xff\xff\xff"), 1337, conn_mode=socket._the_interface.UDP_MODE)
        socket._the_interface.socket_write(self._socknum, data, conn_mode=socket._the_interface.UDP_MODE)

# Setup the socket
socket.set_interface(esp)
sock = UDPSocket()
sock.connect((bytearray(b"\xff\xff\xff\xff"), 1337), conntype=esp.UDP_MODE)

def printUDP(arg):
    try:
        sock.send("{}".format(arg))
    except:
        pass # Ignore any failure to send

I'll try that. I'm currently using the one that was posted in discord.