Try to register hotkeys to see which are available (out of the options SonaSoft allows)

check_for_hotkeys.py

import itertools
import ctypes

kNO_REPEAT = 0x4000
MODIFIERS = dict(ctrl=0x0002 | kNO_REPEAT,
                 alt=0x0001 | kNO_REPEAT,
                 shift=0x0004 | kNO_REPEAT)

def hotkey_is_available(mods, vkey):
  hotkey_available = False
  try:
    if ctypes.windll.user32.RegisterHotKey(None, 1, mods, vkey):
      hotkey_available = True
  except:  #pylint: disable=bare-except
    pass
  finally:
    ctypes.windll.user32.UnregisterHotKey(None, 1)
  return hotkey_available

def generate_all_modifier_combos(basic_modifiers):
  mod_codes = []
  for n in range(1, len(basic_modifiers.values())+1):
    for mods in itertools.combinations(basic_modifiers.values(), n):
      mod = mods[0]
      for m in mods:
        mod = mod | m
      mod_codes.append(mod)
  return mod_codes

def to_readable_modifier_keys(modifier):
  text_modifiers = []
  for key, value in MODIFIERS.items():
    if value & modifier == value:
      text_modifiers.append(key)
  return text_modifiers

def get_vkey_code_map():
  # Digits and numbers
  key_map = {}
  for i in range(0, 10):
    key_map[ord(str(i))] = i
  for i in range(ord('A'), ord('Z')+1):
    key_map[i] = chr(i+32)
  # Special keys
  key_map[8] = "tab"
  key_map[9] = "backspace"
  key_map[37] = "left"
  key_map[38] = "up"
  key_map[39] = "right"
  key_map[40] = "down"
  key_map[106] = "numpad_mult"
  key_map[107] = "numpad_add"
  key_map[108] = "numpad_separator"
  key_map[109] = "numpad_subtract"
  key_map[110] = "numpad_decimal"
  key_map[111] = "numpad_divide"
  for i in range(96, 106):
    n = i - 96
    key_map[i] = f"numpad{n}"
  for i in range(112, 128):
    n = i - 112 + 1
    key_map[i] = f"f{n}"

  return key_map


def main():
  vkeys_map = get_vkey_code_map()
  mod_list = generate_all_modifier_combos(MODIFIERS)

  valid_hotkeys = []
  invalid_hotkeys = []
  for mods in mod_list:
    for vkey in vkeys_map:
      if hotkey_is_available(mods, vkey):
        valid_hotkeys.append((mods, vkey))
      else:
        invalid_hotkeys.append((mods, vkey))

  if not invalid_hotkeys:
    print("No assigned hotkeys found")

  for mods, vkey in invalid_hotkeys:
    s = " + ".join([x for x in to_readable_modifier_keys(mods)])
    print(f"Hotkey assigned: {s}, {vkeys_map[vkey]}")


if __name__ == "__main__":
  main()