I’ve now removed all the previous components listed earlier in this thread, so apologies to future visitors if that causes some momentary confusion!
However…
May I present (with ideas, feedback… and the component name 
from @iCFO)
@iCFO , genius idea to use interactive view for giving the mapping feedback. Don’t know why I never thought of that 
. I hope you like the result!
And may this be the dawn of a new age of simplified row splitting and filtering! 