There we go. Just needed to edit
/etc/X11/xdm/Xservers.
Which means I can use .xinitrc with impunity!
Because xdm won't fuck it up! Yay!
Uh, but fonts still don't work.
Because I changed ptkfonted-0.21 to ptkfonted-0.3.
Stupid me.
Added ptkfonted/fonts/SAMPLE.