Build Up Hardie Trim

I saw a video where two pieces of pvc were laminated together to give the head trim a a greater reveal. Is this or can this be done with Hardie?
I posted this on 4/11. Since then I found this on Hardie’s website: https://assets.ctfassets.net/dzi2asncd44t/3wt4cYHwWF2tBIBCie1ccF/dd37bec02b4df61a39f525ad610e3b88/DS-05-Adding-Architectural-Depth-to-HardieTrim.pdf
Are there potential issues with adding a filler board? We won’t have a rainscreen.
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