VPN 2FA using text message

Is there a way to set up 2FA on a VPN connection to a Draytek Router without using MOTP?<br/>
Users are finding this complicated to setup and are resistant to using it.<br/>
Something similar to that which you get when logging onto a banking site.<br/>
i.e. you get an SMS with a code.<br/>
<br/>
Appreciate any responses.