I've now borrowed a pump mechanism from another save that creates high pressure that pushes stuff in and using NEUT+ELEC, E-HOLE would make it work better but it's another reason why I posted in feedback about disabling sprks because NBLE triggers the E-HOLE to stop doing its thing and makes the star not work as intended.
You could also use high-energy WARP; that EXOT turns into with excessive electron radiation. Fill a container halfway with EXOT, fill the container with electrons until all the EXOT turns into WARP, then add some neutrons and then FIRE or PLSM. The neutrons produced from fusion and the electrons produced from the WARP will sustain the fusion until the WARP runs out, which will take a while because high-energy WARP made from EXOT is long-lived.
Also, there's no way to stop electrons from sparking NBLE during thermonuclear fusion, so making a star in E-HOLE will never work.