The most difficult part in your setup is to make untraceable the VPN you run after going through Tor.
The problem is: if you believe this VPN is safe / untraceable enough, why do you even use Tor in the first place ?
The problem is that you, at some point, pay the VPN, and that is very likely to be linked to your real identity somehow.
The problem is that you, at some point, pay the VPN, and that is very likely to be linked to your real identity somehow.