Exact pixel width in crop

Is there any way to crop to an exact pixel width in Develop mode?
I often need to crop to exactly 440 pixels (without enlarging or contracting content, so I can't do it in Export) and find I have to either do it in Photoshop or keep switching between Library mode (to see the size in pixels) and Develop mode (to guess a little bit more or a little bit less with the crop tool) - of course I can never achieve it exactly this way.
Am I missing something? This seems like such a basic parameter for cropping, more so than aspect ratio, which is well respresented.

I need exactly 440 pixels because that is the exact size that fits in my blog - a technical consideration and also very much a stylistic/publishing one, so that all the images on the blog are the same width. I imagine all layout artists must usually work to these kind of size constraints.
As long as the image is large enough (in pixel terms) I can crop it "artistically" any way I like (eg 2534 x 1679 pixels) and then export it at 440 pixels width and that's fine. This is exactly what I do in many, indeed most, circumstances, and any half-decent photo will of course be larger than 440 in width, so no problem there.
The problem arises when the subject matter (usually a distant bird) is smaller than 440 pixels width and yet I want to show as much detail as possible on my blog. It'll be a "record shot" usually of something quite uncommon for some reason - so I guess that would fall much more into the scientific or technical camp. Then I don't want to shrink the exported image at all as the subject matter is quite small enough already at full size. That's why I have to crop it to exactly 440 pixels wide (the height really doesn't come into it). Neither do I want to enlarge the image to 440 pixels as there's really no point and I'll end up with even blurrier pixels.
I have a feeling that the general principle that lies behind this requirement must be very common. I have sometimes even sold images to the press where they needed a particular item, for which I only had a lousy shot but it was good enough for a drop-in about an inch across. OK, publishers won't be using Lightroom to do their image resizing (although why not?), but when I publish my blog I want to go through as few unnecessary steps as possible (don't we all…)

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