I know previously people have suggested Phillips warm glow 6” retrofit can lights but those seem to have gone off the market. 
 

Can anyone suggest a currently available 6” retrofit LED can light that is compatible with Insteon dimmers?

I haven't specifically tried their retrofit LED lights, but I installed a bunch of pot lights to replace multiple can fixtures from Amico (via Amazon) and have been very pleased with the results. They have a variety of different size retrofit and pot lights in black or white. You can set color/warmth (2700K/3000K/4000K/5000K/6000K) easily, and they also offer a "night light" feature which just illuminates a small ring around the outside of the light (we use that in a home theater setting and it's awesome). 

I haven't had any issues using the new Insteon paddle switches/dimmers with the pot lights.  But your application, and how many fixtures you have on the load, may differ than mine. BTW - you can buy about a dozen of the retrofit fixtures for about what it costs to purchase one Insteon switch these days, so check the reviews and give it a try. If you don't like it, you can always return it.  

 

 

Edited February 25Feb 25 by dwengrovitz

So most dimmable can LED work fine with Insteon as long as you have at least 12W total on the circuit.  I have FEIT 6" retrofit can lights, and eco smart retrofit in different places depending on flood v. spot that I am looking for.  In other areas I have large spot bulbs that also work just fine.  They don't adjust like some other brands, these are simple lights in either "warm" or "cool".  I use the bluer cool in the kitchen and warm every where else.