You keep coming back to this. In terms of the NATO benchmark, it is my understanding there are guidelines for what is considered 'defence spending'. If it's just to keep The Donald happy, what's the point? Might as well throw in housing, healthcare and regional development. I'm sure there is a national defence angle in there somewhere.
PMQs and modern good quality singles quarters. Thousands and thousands of housing units could absolutely be buried as defense spending- and it would even be largely honest given that it would support recruiting and retention and allow for units to grow.