Yes that seem to be for the moment the less complicated way. I chose for what I attached to the lower system the placing “above” what nearly does the Job even without much to do in the engraver mode.
However, I still think from the musical standpoint, this might be worth to think about for the developers, the automatism that makes a crescendoline stop with the next dynamic sign might be improvable for situations where a crescendo should even continue after.
I personally think it is not that much the question what is “logical”, as we consent, in what the composer mean (the ‘sfz’ as kind of stronger articulation of certain notes during a crescendo which should continue to develop up to the “F” in the following bar). Since Notation is as good as it comunicate just what the composer means I can’t see any reason why it should not be able to write what he has written.
I am so sorry, but the composer lived from 1865-1951 so I fear there is no chance to persuade him in any way any more
(while he was even in lifetime very proud of not being to easy to be persuaded in musical questions at all.)