@Kerensky18 Went to using this pre-made Cron script that changes mac every 10 minutes.
In DD-WRT go to Administration and Paste this into Additional Cron Jobs:
0 0,3,6,9,12,15,18,21 * * * root nvram set def_whwaddr=4E:53:50:4F:4F:40 sleep 3 && nvram commit sleep 5 && reboot
9...