Patch the heck out of it.

_patches/stellarwp-shepherd-correct-container-typehint.patch

@@ -0,0 +1,11 @@
+--- a/src/Config.php
++++ b/src/Config.php
+@@ -10,7 +10,7 @@
+ namespace StellarWP\Shepherd;
+
+ use StellarWP\Shepherd\Config\Container;
+-use StellarWP\ContainerContract\ContainerInterface;
++use TEC\Common\StellarWP\ContainerContract\ContainerInterface;
+ use TypeError;
+
+ class Config {

_patches/stellarwp-shepherd-remove-files-autoload.patch

@@ -0,0 +1,12 @@
+--- a/composer.json
++++ b/composer.json
+@@ -28,8 +28,5 @@
+         "psr-4": {
+             "StellarWP\\Shepherd\\": "src/"
+         }
+-    },
+-    "files": [
+-        "src/functions.php"
+-    ]
++    }
+ }

composer.json

@@ -34,7 +34,7 @@
     "stellarwp/installer": "^1.1.0",
     "stellarwp/models": "dev-main",
     "stellarwp/schema": "2.0.1",
-    "stellarwp/shepherd": "dev-temp-no-namespace-files",
+    "stellarwp/shepherd": "dev-fix/php-74-standalone",
     "stellarwp/telemetry": "^2.3.4",
     "stellarwp/uplink": "2.2.2"
   },
@@ -159,6 +159,10 @@
     "patches": {
       "fakerphp/faker": {
         "Use prefixed Psr\\Container\\ContainerInterface": "tests/_patches/faker-use-prefixed-containerinterface.patch"
+      },
+      "stellarwp/shepherd": {
+        "Remove files autoload": "common/_patches/stellarwp-shepherd-remove-files-autoload.patch",
+        "Correct Container type-hint": "_patches/stellarwp-shepherd-correct-container-typehint.patch"
       }
     }
   }

src/Tribe/Main.php

@@ -81,6 +81,9 @@ public function __construct( $context = null ) {
 
 		$vendor_folder = dirname( dirname( dirname( __FILE__ ) ) ) . '/vendor/';
 		require_once realpath( $vendor_folder . 'vendor-prefixed/autoload.php' );
+		// Manually require the prefixed functions.php file.
+		require_once realpath( $vendor_folder . '/vendor-prefixed/stellarwp/shepherd/src/functions.php' );
+
 		require_once realpath( $vendor_folder . 'autoload.php' );
 
 		// The DI container class.