Hello Hal,
You are absolutely right that slots would be more practical, but it is possible that the cloud would get lost with the strings running over it.
I think the best way to check would be to do an experiment with the cloud and no slots on my 78 and see if this is actually possible or a reasonable compromise. The slots could be another option. Interestingly enough, have found that I never snap strings on my Series 1, think it may be due to the good bridge set up and the 32 inch scale which doesn't have the tension of a 34. All my other basses are 34, but somehow they seem too long and too tight now...