The measure copy may not work all the time depending on how the original pattern was created, the insert then copy works all the time. The individual track copy is on page 2 of the pattern copy menu and allows individual track to track from source to composer.

the sequencer route is easy:

you have your new C major 8 measures cleanly in the sequencer... use step record if you get glitches pushing buttons live.

on the APC to SMF page, just arrange tracks 9 to 16 in order down the page, drum1, drum2, bass, acc1, acc2, acc3, acc4, acc5. Press convert wait till play stops.

go to sequencer to composer copy page. From left to right set measure first 1, last 8 (assuming these correspond to your sequencer measures), select a composer variation to place the pattern, in the track column put 9 at the top down to 16 at the bottom. Press Ok. Exit out, make sure the sequencer play is OFF and play the composer pattern normally.

You will have to balance as described above.