Maybe I could have ordered without clamp, but they don't have that package on the web. I'm not sure if I remember correctly but I think they also did sell it without clamp in the beginning. I'd guess the glueing and not selling without clamp is some business decision rather than technical.Gentle sarcasm apart, I'm certain your dealer could've ordered the D4 with no clamp mounted. AS is typically open to customization requests, they even produce parts on demand.
That being said the 'classic' and 'monoballfix' clamps are clearly not convenient on a Techno, I've similar issues with my folding 4x5. As soon as I could live without the D4 for a couple of days next winter I'll send it to AS and ask they take that clamp off.
Anyway, I've now decided to keep it as is and go on with the classic screw clamp for some time at least. A third-party screw clamp would lose the usefulness of the pano scale on top as you lose the arrow pointing out the position. Not too bad for me as I would rarely use it (I generally don't stitch), but it's a "nice to have" thing which make the case stronger for using the original clamp. I did not know this before I got a close look on the head.
The screw clamp is a bit slow to work with, but for my uses it is better than the two other Arca-Swiss alternatives. For flip lock I'd want a huge lever that can be operated with gloves, like many of the third-party clamps (but not Arca-Swiss), and I'd prefer a tuned system without calibration screw like the RRS (I already have an RRS plate on the camera).