Neither of your stated options is a good one.
Given the stated condition of the aperture blades, the best option would be to replace them with good ones from a (non-functioning for some other reason) donor camera. For some few shutters, it's possible to fabricate new aperture blades (easier than for a leaf shutter, since they don't need to move rapidly at high acceleration).
If you leave the blades as they are, you'll find the aperture quits working completely before much use has occurred; worse, the shutter is likely to fail as well due to rust granules getting into the tiny moving parts. If you remove them, you will have little control over exposure and no control of depth of field.
The most practical solution here is to buy another Yashica 35, either as a blade donor or a user, and keep the less functional camera as a parts donor. There will surely be other parts you'll need if you continue to use one of these; a donor camera is a good thing to have.