
LHD similar to juan Carlos and Trieste offer a lot of capability for a "decent" cost however they are still out of price range for many countries.
NATO offers a mechanism whereby several small countries band together and purchase expensive equipment, this has been done for AWACS and tankers by European NATO countries.
The global warming, China and other developments point to an undefined future, making planning very hard. China does have global ambitions, and it has already started showing an interest in the arctic region, where NATO currently have few bases.
I suggest that an LHD developed with arctic conditions in mind (e.g. ice class similar to the Norwegian cost guard ships (up to 100 cm thick ice, etc.).
Belgium, Canada, Denmark, Germany, the Netherlands and Norway could contribute, and buy a number of LHD, each equipped with several F-35B and loyal wingmen, and potentially "marines" for land operations. In particular Canada and the Netherlands have or will have very potent frigates (quasi destroyers) that can protect an amphibious task group. Subs is more of an issue, perhaps the UK can contribute. Split between so many countries it should be realistic to buy 6-8 LHD specifically designed for arctic conditions.
This proposal would also "force" some NATO countries to move closer to their promised 2% NATO spending goal...