In some circumstances you should maintain a printed load sheet to satisfy the law. It would seem to me to be irrelevant (for private & training flights) how you generate the paper copy, as long as all the required data appeared in a clear format.
So format your spreadsheet to print out in a way that shows all required numbers, and carry the signed printout.
You could of course print several copies of your "standard" load in advance, ready for each flight - if you fly the same aircraft loaded in the same way each time. Or print blank sheets and plug in the numbers in ink based on your on-the-spot spreadsheet data.