EDIT: I think I've managed to confuse myself quite nicely. It appears that getting to ICS is as simple as copying to the ext sd booting into recovery and installing. Is it still possible to use safestrap to switch between ICS 230 and my stock 905 or am I misguided by the definition of a ROM. I've read myself silly today, will get at it again tomorrow.
905 is Gingerbread, ICS is well, ICS. You cannot safestrap between GB and ICS. What you need to do is find a custom rom based off of the ICS leaks to install.
Edited cause I mixed up safe and non-safe side
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