pyramid - how to automatically map the version of deform's static components that you're using to a subdir (on startup)

__init__.py

def main(global_config, **settings):
    ...
    config.add_subscriber(\
        'myApp.subscribers.deform_static_prep', 
        'pyramid.events.ApplicationCreated')
    ...

development.ini

deform.static_subdir = deform

subscribers.py

import deform
import os
import myApp
    
def deform_static_prep(event):

    static_subdir= event.app.registry.settings['deform.static_subdir']

    deform_dir= os.path.dirname(deform.__file__)
    deform_dir_static= os.path.join( deform_dir , 'static' )
    
    app_dir= os.path.dirname( myApp.__file__ )
    app_dir_static= os.path.join( app_dir , 'static' )
    app_dir_static_deform= os.path.join( app_dir_static , static_subdir )
    
    if os.path.lexists(app_dir_static_deform):
        os.unlink(app_dir_static_deform)
    
    os.symlink( deform_dir_static, app_dir_static_deform )