Spoke to Indy mechanic about this and his response was mostly quizzical as to effectivess and possibility of fault codes being thrown if operating outside temperature range. Then he quoted me the price for doing the job (5hr labor, btw) which has me rethinking whether a 10, maybe, 15C temperature drop will make a significant change in mean time to failure...particularly considering this isn't a vehicle that typical sees daily driving. I figure I'll save paying the labor for an actual failure and perhaps I will try to tackle this on my own further in the future (or be cursing myself for not having done it earlier when the coolant and turbo lines need replacing, lol!). I look forward to hearing your long term experience 550iFreak.
There's no need to panic until it is time to panic.