Astronomy.com's Here's why we can't just rocket nuclear waste into the sun is an excellent explanation of the delta-V required to launch from Earth orbit into the Sun (30 km/s) vs. to escape from the solar system (11 km/s). So a minimum energy strategy to hit the Sun would be to reach nearly escape velocity, wait to reach apogee at a near-infinite distance, then kill all angular velocity at apogee.
But is it possible to slingshot angular velocity to zero within the solar system in order to hit the Sun using less than 11 km/s of acceleration? Something like skimming just ahead of Jupiter in its orbital path and being flung backwards?
It shouldn't be too hard to write a 2d numerical simulation to visualize the possibilities, but surely someone has already answered the question of whether the minimum delta-v is less than that required for the near-infinite distance maneuver. (see Has any object launched from Earth gone into the Sun?, @StarMan's answer to Do you need 0 km/s velocity to crash into the sun?).