DHCP Realy not working with Remote User Access

Hi Here,

I need help, I implemented an SCCM server but I am not able to run the pxe boot as my DHCP server is in another network, researching a little bit, I found out that it could be done using IP helpers (DHCP relay for peplink) but when I tried to do it that way, I realize that it was not possible as it is not compatible with remote user access. Is it possible to have them both available in the peplink? Any kind of help will be much appreciated.