Does anyone other than Paul Components make long-pull inline brake levers?

Any inline lever will work just fine. It is not doing the cable pulling. If you are looking for flat bar levers there are lots of options but my favorite would be Speed Dial 7s from Avid if not the Paul Love Levers.

Speed Dials are great but they are not 'inline levers'. I don't personally know of ANY long pull inline levers (Cross Levers), but if the o.p. says that Paul makes some, and they are ok with the $$$ then, who am I. But, if it were me driving (and it was) I would use standard short pull levers, and matching inline levers, and either get short pull calipers, or 'Travel Agents' to convert the pull ratios at the caliper.

Do they? The Tektro RL720s (for example) are described as compatible with cantis and road calipers, but not V-brakes.

Really...

Don't the actually work by pushing the housing? The cable itself isn't fixed to them, it just passes through, right? so they, really, technically can't pull it.

So yea - but the amount that it pushes the housing equals the amount of cable pulled. It isn't the anchor for the cable. You may find that you have to bring the lever to the bar to get braking... although you could just run your pads closer to your rim.

As mentioned above, they technically push instead of pull, but the result is the same, and it does matter which you use.

So maybe technically they should be called “short push” or “long push”. But the bottom line is you still want to uses the right one.

Yes, in a Bowden cable and housing system as found on bikes, pull of the cable and push of the housing are equal and opposite forces, they are equivalent and achieve the same thing. It doesn't work any other way.

Sorry my comment was meant to be ironic, not start an argument , because this is clearly the basis of how all bike cables function. Just poking fun with a bit of Newton.

No argument, I believe we are all on the same page.

And it is a good concept to understand. And now I know the name for it (Bowden Cable)

So, long push CX levers. Someone should step up and make them. Long push or LP. To use with linear pull (LP) calipers. I like.

Practical concerns. To get a longer push, the housing needs to stand further off the handlebar and seat at a higher location from the lever pivot. Also the housing will move more. I suspect that it will be a little harder to arrange this to be as tidy around and under the handlebar wrap. I'm guessing a couple of prototypes needed.

Maybe not, I would have thought generally they are cross compatible (LOL) but I guess maybe they may not. The Pauls do have a different pivot point for linear pull and long pull disc brakes it looks like. The wisdom an old mechanic passed to me a while back is that didn't matter as much but maybe it does.

Yes actually.

From Park Tool:
The in-line lever pushes on the housing, effectively making it longer, which causes the brake caliper to close on the rim.