Scripts to enable Assistive Access programmatically on OS X El Capitan.

assistive-access-el-capitan.py

#!/usr/bin/python

# Grant Assistive Access to Terminal and “osascript”.
import sqlite3
conn = sqlite3.connect('/Library/Application Support/com.apple.TCC/TCC.db')

conn.cursor().execute("INSERT or REPLACE INTO access VALUES('kTCCServiceAccessibility','com.apple.Terminal',0,1,1,NULL,NULL)")
conn.cursor().execute("INSERT or REPLACE INTO access VALUES('kTCCServiceAccessibility','$(which osascript)',1,1,1,NULL,NULL)")

conn.commit()
conn.close()

assistive-access-el-capitan.sh

#!/bin/sh

# Grant Assistive Access to Terminal and “osascript”.
sudo sqlite3 <<EOF
.open '/Library/Application Support/com.apple.TCC/TCC.db'
insert or replace into access values('kTCCServiceAccessibility','com.apple.Terminal',0,1,1,NULL,NULL);
insert or replace into access values('kTCCServiceAccessibility','$(which osascript)',1,1,1,NULL,NULL);
.quit
EOF

Would disabling SIP work?