The basis of my theory are observations, that magnetic fields, scalar waves and neutrinos affect speed of nuclear reactions. Magnetic field is indeed too weak for being able to affect nuclear reactions directly, in scalar wave physics it can concentrate particles (scalar waves and neutrinos), which already have such an ability. You can imagine it like effect of wind to location of paratroopers landing: wind is too weak for being able to affect heavy person and parachute (to which such a person is attached) is too lightweight for to make significant impact. But connection of both bodies already enables the both. In dense aether model the neutrinos are surrounded by invisible scalar ("magnetic") charge, which has much larger scope than weak charge of neutrinos and interacts strongly with magnetic field. The magnetic field thus affects the propagation of neutrinos in similar way, like charge field affects path of electrons and pair of bucking magnets behaves like optical lens for them.
In dense aether model neutrinos are solitons of scalar waves in similar way, like photons are solitons of light waves. They don't interact very strongly with observable matter, but due to high density of nuclear matter the speed of their propagation gets greatly slowed down at the center of atoms. Here I presume, that neutrinos can get trapped by atom nuclei and they could bounce across it like standing waves, which they're also oscillate by itself (disappear and reappear periodically). When resonance condition of both periodic effects is met, the even subtle neutrino can affect nuclear reactions significantly, because it can bounce from inner surface of atom nuclei multiple-times.
In droplet model of atom nuclei nuclear reactions can be compared to coalescing of mercury droplets: their interaction requires temporal formation of thin neck with strong negative space-time curvature, which will initiate their merging (activation energy). And weak charge of neutrinos or neutrons serves here like tiny bubble of vacuum of strong negative space-time curvature. Another option is, the weak charge of neutrinos breaks CP symmetry of strong force and nonradiation condition of excited states, which usually prohibits in their interaction. The magnetic field thus doesn't affect speed of nuclear reactions directly, but it focuses neutrinos, which can already catalyze them.