There are smaller versions of xorg packages available, xorg-vesa would be one. Importing xorg-vesa requires about 58 MB of files, xorg-all requires about 94 MB of files. So xorg-vesa would be the smaller. There are also smaller xorg packages including specific video cards.
Xvesa has been tried and used, at last time a few years ago it did now work at the time with dCore, but I don't know why and am willing to test it further in the future.
With dCore, very important to notice the kernel version in use, since there are several with dCore x86.