There;s a few that can reprogram the 555. I believe Dustin Whipple is one. Can't quickly the remember the other(s)

You better put up a pic of your ECM because crusader nor Indmar nor BARR ever used ECM or PCM 555 (Motorola) never.. You said that you installed a crusader / pcm bobtail engine package. If I recall that package should have came with a ECM already installed. Is that correct or was Mercruiser parts installed to fully dress the crusader package as it did not have an ECM ?

Crusader used MEFI. just saying

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Not the best pics but it's all I have on my phone.
How could I convert these risers to dry? Would they have to be sent back to stainless marine?