There should be a 3.0 oz Sport option on the insulation dropdown; try reloading the page or adding the kit to your cart from the main kit list.
3.7 oz Climashield would work, but I think if compressibility is of prime concern Primaloft would be a better choice. I think you’d be happy either with the standard 1.8 oz basis weight Sport, or if you felt you needed more the 3.0 oz. Primaloft is softer and has a better drape which makes it work particularly well in apparel.
There’s no problem with getting the shell & liner combo you want—just shoot me an email after placing your order to let me know that’s what you want as it isn’t going to be able to be added to your cart that way, but the reversibility option is going to be complicated somewhat by the final seam which runs from the cuff to the hem. This seam doesn’t lay flat when it’s finished, so you’d have a ridge on the outside of your jacket. You could make it happen with some bodging…