One would assume not, the design in the Fourth protocol is basically the same as that utilised in the Hiroshima bomb, and from what I have read to make that work took firing one half of the neuclear material at the other down a discarded 8" naval gun. If less force was used the two halves would blow themselves apart in the initial stages of the reaction causing the reaction to stop.

Later devices have relied on some form of explosive compression of a subcritical lump which is assumed to be a necessary technology to build miniaturised weapons.

However take this all with a grain of salt because I'm not a physicist with any real expertise in building these things, and much of the information in public literature is probably misleading.

Any idiot can face a crisis - it's day to day living that wears you out.