.......... capt.
Aye it appears we were taught a differing philosophy on these.
Single engine IMC should be planned with worst case in mind, as one does not have the option of continuing to an area where the spiral technique, or any other may be used, multi engine .. well you are having a bad day, just land it on the nearest bit of flat ground that conditions permit, and at the planning stage you will have considered the en route diversions.
Order for actions ? :
Turn the fuel off at the selector/firewall cut off... contain the fire the correct side of the firewall.
Mixture rich/throttle fully open, burn the fuel, we don't really care too much what burns because the fire is contained behind the firewall, and the limited fuel available in the lines forward of the cutoff should mean a short combustion .... with the fire out we now wish to ensure no further fuel will be available, hence throttle closed and mixture ICO .. now head for terra firma.
While planning your landing with the fire safely extinguished you have time to do the housework, check mixture ICO, throttle closed, fuel pump off, mags off, (prop feathered, crossfeed, look after live engine if in a multi).
For this I was taught (and teach) a left to right flow: it covers the POH items, but an item or two may be out of sequence, it ends with door unlocked, harness tight, pax brief.
Keep in mind that this is a time critical situation, thus these are memory items, not type specific.
POH may well say something different, and in some cases with very good reason, if so find out why, but in the unfortunate event that one is faced with this problem airborne, a set of memory items is a good idea.
The bottom line is that the items are covered, the objective, a survivable situation.