[Update: classfellow A.N.'s convincing comment causes me to edit this post to make clear that I more accurately say that MacDonald Fraser is a Kipling-esque character than using "Stalky"as the term. Stalky is indeed not a "jelly-bellied flag-waver."]
A just-deceased version of [snip] a "flag-waver" as Kipling calls such—is George MacDonald Fraser, author of the Flashman series. (Incidentally, Flashman is a literary character taken, in homage, from the book to which Kipling made his own homage in Stalky & Co.: Thomas Hughes' 1857 Tom Brown's Schooldays—itself homage to the real-life Thomas Arnold's Rugby School.)
His wartime biography, which I have, is titled (in a phrase from Kipling's great "Gunga Din") Quartered Safe Out Here, and is very much an echo of the "Slaves of the Lamp II", the final Stalky chapter.
A flavour of MacDonald Fraser's lineal Edwardian attitudes can be found, unalloyed, in this article of his, online, "How Britain has Destroyed Itself."