Singapore to Munich - Chance of Equipment Swap?

[SilverChris]

No, the (non-derated) 777-200ERs can easily fly SIN-MUC.

And they would fit the F passengers in J I presume?

[SilverChris]

SQ's JumboJets have a low utilization rate. There is generally at least one available at SIN for substitutions.
.

Even after all the temporary swaps (before SQ11/12 becomes 380)? Eg MEL, SYD.

[FlyBoy]

And they would fit the F passengers in J I presume?

Not much different from being bumped from suites to first I think

[zvezda]

And they would fit the F passengers in J I presume?

Writing from experience, the very small number of F passengers would be offered the choice of taking the scheduled flight in J, taking the next day's flight in F, a full refund, or accommodation on another airline.

Even after all the temporary swaps (before SQ11/12 becomes 380)? Eg MEL, SYD.

Yes.