Got it to spit out an empty mod that OpenMPT loads.

modgen.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+
+import sys
+import struct
+
+with open("out.mod", "wb") as fo:
+
+	# Module name.
+	fo.write(struct.pack("20s", "TEMP".encode('utf-8')))
+
+	for i in range(1,32):
+		# Sample name.
+		fo.write(struct.pack("22s", "SMPL".encode('utf-8')))
+
+		fo.write(struct.pack(">H", 0))		# Sample length.
+		fo.write(struct.pack(">B", 8))		# Finetune.
+		fo.write(struct.pack(">B", 64))		# Volume.
+		fo.write(struct.pack(">H", 0))		# Loop offset.
+		fo.write(struct.pack(">H", 0))		# Loop length.
+
+	fo.write(struct.pack(">B", 0))		# Song positions.
+	fo.write(struct.pack(">B", 42)) 	# Obsolete.
+
+	# Pattern table.
+	for i in range(0, 128):
+		fo.write(bytes(b"\x00"))
+
+	# 31 samples mode.
+	fo.write(struct.pack("4s", "M.K.".encode("ascii")))