Take it to a spring shop. Don't hack what are perfectly 'saleable' springs just for your short term gratification.

If you cut the springs, will they remain to be captured within the shock absorber travel at full droop?

There's got to be a better way..

All A-series are the same weight. Fat people don't go out and specifically buy new springs. Engine weights within 0-50kgs difference will not make a noticable difference.

I would reconsider using 120Y struts if they are going to cause you so much trouble.

But getting properly setup set of 120Y struts in 1200 shouldn't be too hard. A suspension shop should have the capability to help by winding up a set of progressive springs to suit..