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Well, it's a lores shader. I'm sure guest can do a hires version too. 
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Well, it's lores with a good reason. I would need to use a slower interpolation algorithm for a hires version and the sound could/would crackle.
Amiga emulation is special regarding this matter and classic crt shaders can't do a perfect job where hires makes sense (Lionheart etc.). But it's not that bad at all in general, though it/they (lores shaders) might require an extra startup configuration as it changes the default settings.
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If I change to lores it works but I get a horizontal jitter of 1 lores pixel left and right of the disk hand and text, about twice per second.
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Yeah such things can happen, jittering happens to me also with various CRT shaders if i include a mask on the WB screen. I can report it clean with the games i tested though.
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To make CRT on LCD I need global desaturation to not have to lower the contrast
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I understand this as a shift towards grayscale. There are some ways to achieve this, shouldn't be a hurdle.
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exponential subpixel blur that I can adjust
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The PD CRT-Lottes uses exponential blur which is adjustable. Worth taking a look.
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raise the black point on odd lines (as in pixel lines, not scanlines "between" pixel lines), and then a mask (edit: for scanlines) can be applied that is as good as the monitor resolution is larger than the Amiga resolution.
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Black point could be something new, didn't see it with popular CRT shaders. Scanline masks can be also tricky, they might require to use a constant vertical integer scale factor and could be applied in linear (not 2.2 gamma) space from my observations.
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After that, there's a point in adjusting the gamma (which should be 2.2 for CRTs on LCDs but, you know, mileage varies).
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Yea this shouldn't be a problem to code.
I left this as an option in the CRT-Scanline shader, it's a bendable rule and it didn't appeal to me in this case since i wanted a specific scanline look. Interpolation looks better with higher gamma and solid scanlines with lower. There is tiny bit of interpolation and a strong scanline presence so the scanlines won.
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This is the recipe. Can you give me some pointers in the right direction to code that guest.r?
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Sure, np. I guess you are more a WinUAE user. HiRes/LoRes doesn't matter too much, you can have both versions. You could start with a horizontal exponential subpixel filter, make lookups gamma correct, apply desaturation etc. You'll see WinUAE is quite specific, looking forward for that.