Sounds like your Dealer is not too familiar with the Triumph diagnostic software
that they use to program the bike with. ( Not that I am either though ! )
The lack of Heated Grips symbols appearing in the Instrument Panel display
is simply due to not having set that option within the software.
The TPMS system uses coded pressure transmitters in each wheel.
Prior to commencing the ECM replacement, the Dealer is supposed to read
the Codes, then re-program them back into the new ECM afterwards.
They appear to have programmed them back into the wrong positions

As far as I know they should be able to plug back in to your Trophy
and re-program them correctly.
The TPMS sensor codes should have been provided on stickers
that should then be attached to your Handbook,
so it might be worth checking you have those

