You need switchable graphics enabled in the BIOS for the Intel graphics to work.
I think you can mod the BIOS like my Precision 7510.
Download my Precision 7510 ventura files. Inside the Boot folder is a folder call DVMT
Copy that whole folder into your Boot folder
Go to the your BIOS and create a boot option, point it to /EFI/Boot/DVMT/boot.efi, call it DVMT or whatever.
Reboot, select F12 and select this new boot option. It'll load the modified Grub
At the boot menu, select 1, this will enable the Intel Graphics and disable the Nvidia, change the DVMT pre-allocated to 96mb. With this you can disable these in the Config file
framebuffer-fbmem : 00009000
framebuffer-stolenmem : 00003001
After that, you should not have to keep re-enabling Switchable Graphics manually.
If you look in the grub.cfg file with textedit, you'll see it does work for both 7510 and 7710.