I admire all the work you did to set that up, but in my experience with RAID arrays over the years I have found that I like things as "standard" as possible.
Years ago, before Adaptec standardized their RAID controllers, if a controller died and you replaced it with a new controller, the new controller could not read the existing RAID array of drives - even though it was in PERFECT condition!
Really fried me at the time, couldn't believe what I was hearing. Their answer, of course, was DUPLEXING which means you buy a SECOND expensive RAID controller from them to keep the server from going down. Naturally, you still have to replace the controllers (and buy 2 no less) it just gives you the opportunity to delay the transition and do a current backup at your convenience.