step one is always buying a harness- keeps the packer in place. you can also make one with elastic and suffering [https://queermushroomforest.weebly.com/diyharness.html/#possible\]

my first rec would be foam packers- simple, and they work, like the one [https://sockdrawerheroes.com/collections/packing/products/sdh-budgie-packer\]

then, for something realistic, id go uno by axolom, but for the shuffling, id go any of axoloms models with moveable balls because [in my expereince] they are softer and easier to manouvre
[also bonus buying from axolom you can get the flexit harness, which is decent]

I don't cycle OR pack but this is a very funny problem to read about, so I feel personally invested in you getting good outcomes somehow 😂😂 Have you considered a jockstrap with a solid cup? You said the skin-tight shorts will show everything but a strap and cup may be typical enough that it wouldn't get a second glance.

A more intensive idea that may involve trial and error is to layer and sew padding in the crotch area specifically, just enough that you dispel the Ken doll illusion. Maybe even with the rolled up sock method, doing a few temporary stitches at the top, bottom, and each side of the sock ball to fix it to the crotch of the shorts? That way you'd just snip the temp stitches at the end and you can wash the sweaty shorts and socks properly.

I'm not sure what would work, but now I'm thinking about this seriously and I might end up trying one of these solutions on some yoga shorts I have and love but can't wear at the gym because of the Ken doll issue.

We're all such opposites.....im MTF and was soooooo glad when I had SRS, now I can wear skin-tight gym wear and not have a bulge! Damn I wish we could swap body parts around, life would be so much simpler. Wishing you the very best in finding a solution to your problem 😊

Wear some damn briefs with the cycling shorts, it's not normal to go commando in these, I don't care what anyone says, they even specify they're not underwear and need a layer between your bits and the fabric. Plus it's really gross. Consider everyone has to see and smell your junk sweat. 😅 Just wear a size or two too small in briefs and you'll be solid. Mtf here, used to have issues keeping tucked my whole life before coming out. I had to find solutions without outing myself, so tight briefs and you'll be golden. Plus it's way healthier for your package.

Uhmm im transfem but this might help

so i play baseball and i wear a thing called baseball sliders under my baseball pants

And they are basically skin tight and have a pocket in the front genital area thats usually for the cup/box

Sometimes they have padding on the side/ butt area but thats just because the main use is for sliding in baseball but there are some that dont have that padding that just are skin tight with the cup pocket

But thats all i can suggest

But make sure you get one with an integrated cup pocket

And then with them i would just use whatever you use to pack doing any other activity (sorry im not trans masc so i dont really know what ppl use to pack)

But thats what i can suggest that might work with cycling cause its skin tight

Idk

Hope this helps and soz if it doesnt