Edit: FIXED
Following the steps you've laid out before, and having done this before with 16, I was looking forward to seeing what improvements you've made in 17. I redownloaded the game, then your mods. The Scripts.rxdata included in the download is non-functioning, resulting in the error below. I only removed the itemban module, none others. Switching back to the original Scripts.rxdata fixes the problem, but that leaves me without mods.
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Pokemon Reborn
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Critical Error C0000005 at address 10036CC2
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OK
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Edit: Leaving the above posted in case someone else has the same issue. I restarted the process, and somewhere along the lines, ended up changing the format of the Mods folder downloaded in the link while putting it in place in my Reborn/Data folder.
Lesson learned: double check everything.