Helioforming is the ignition of gas giants of various sizes, or black dwarves, to create protostellar or even stellar celestial bodies. This can be achieved in two ways: compression or mass increase, both of which elevate the celestial body's density over the critical point for fusion to happen.
I have been thinking about a way to achieve this feasibly in a (somewhat) high/hard sci-fi setting and I think I found a solution: dark matter, specifically WIMP dark matter.
WIMP stands for Weakly Interacting Massive Particle, a potential candidate for dark matter, which means particles that interact weakly with baryonic matter but possess a considerable mass and thus can create impressive gravity wells while being effectively invisible and intangible.
My solution would consist of utilizing technology to manipulate dark matter and deposit a considerable amount of it in a gas giant's core, increasing its mass while not increasing the volume, and thus maximizing density increase, until the ignition point is met.
On top of that, since dark matter is much more abundant than baryonic matter, it would be much easier to obtain and use on a truly massive scale.
The idea came from the following video by Isaac Arthur on dark matter technologies
Would such a feat be feasible for a civilization between level 1 and 2 on the Kardashev scale in a setting with physics resembling the real world?