I had thought about Icon's as well, but last time I figured the price difference it wasn't much more to get the kings when you add in $240 for springs onto a F/R set (Assuming they use 14" springs on the 1500 set). I might hit them up as well for just a set of front coilovers if they can do it fast. And yea what a debacle indeed, I had ordered the eibach stuff the same week I ordered my bumpers assuming that I wouldn't be sagged out for too long. I went with that setup since I figured it would get me by until I decided to upgrade or just live with lower tier suspension.
https://wheelersoffroad.com/i-25489842-icon-14-x-700-lb-coil-spring-for-2-5-coilovers.html
Icons come with 650lbs springs in the RAM application from what they told me, but if you order them with the 700lbs springs you should not have to pay extra though I’ll call them 1st to make sure,i don't know if those 650lbs springs are 14" though but you can also ask them about that. they come preset at 2.5" lift, and it seems you could go to 3"
Bruiser did a great job documenting his Icon install, for example
https://www.ramforum.com/posts/1954003/
From my King install i can tell you the OEM performance from Kings uses a 14" long spring, 500lbs rate, 3.75" diameter. You could go 3.5" lift maybe a tad more, Icon says good up to 2.5” id think you could go 3", you can also order them with heavier springs, heavier springs will change the valving so it's recommended to go witth a vendor that can do the tunning as is just not as simple i want to go from 500 to 700lbs springs, techincally yes, realistically you want to valve the shock for what you need/want including truck total weight/spring pressure/height etc etc.
For instance, this is Kings OEM set at 2.25", look how many open threads you have underneath the collar, that's how much you can go up, but how much up i have no idea.
They come preset or at least mine did for about 1.5" lift, and you can't go lower than that in this particular application, i went up 3 full turns and that put me around 2.25"
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RAM RSM, on Flickr
With stock bumper, this is pretty much how you set them for 2.5" lift, or 4 full turns, i could go up another 1" for a 3.5" easy, but i'm not interested in going there, i'm saving those open threads for extra weight, at 2.5" of lift i have about 3.5" of available droop, great CV angles, no issues with diff, tie rod angles are good etc, etc. If i lift another inch, that droop will go down to 2.5", Icon for example says they don't recommend less than 2" or the ride will suffer. Most of this stuff if not all are are tuned to live in the middle anything in between 2-3" lift will make your shocks work as intended.
Can you go up ? well up to you as the adjustability is there, i like my suspension to have full travel up/down as i use it all
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RAM RSM, on Flickr
Regarding shipping speed when it comes to 2.5 performance shocks or above, typically you have to wait 3-4 weeks as they’re made to order, perhaps there are dealers out there that could stock some ? You can contact Nick@gotexahust to see if he mau have some returns, maybe Carli or Thuren as they’re basically shops that make specific items for RAM's using Kings for example for their performance options though their prices are a little too much in everything they sell, or you could go with other big dealers like Filthy Motorsports (King dealer) or SDHQ Offroad (King,Fox,Icon), though Filthy told you 1-3 weeks? that means the're prob not stocking either. For the most part 2.5 body and above performance shocks are not available for you to open a box right away and take them home unless perhaps you're going straight to the manufacturer, and still.. i tried that approach with King (30 miles away from my house) and Radflo (25 miles away) and all they had available was to fullfill orders. Believe it or not this companies flip this stuff like hot bread and their demand is just crazy.
Good luck with whatever you decide.