I'm not able to find a (relatively) simple solution for this problem with accidentals.
Does exist a trick I overlooked or should I use the enharmonics?
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The Dnats that receive a tie are courtesy accidentals. I would simply put them in as text. NWC 2.5 (currently in Beta) makes it clean and easy.
If you want to shock the purists, try the attachment (ver 2.1). IMO, it is much easier to read.
Very good observation!
Thank you.