Hi,
TPM2 will be the correct way as in case if you reverse the document in FI alone, the further valuations in treasury will be incorrect as the valuation was with reset.
The only round about way I could think of is to mark the relevant update types as not relevant for posting, run TPM2, then run TPM1 again by manual valuation alone so that the treasury ledger reflects correct book value and further valuations are proper. Then mark the update types are relevant for posting. So that during this process, nothing is transferred to FI.
Then post the reversal of the reset document of the original valuation run in FI. Please note that this has to be a manually posted document and you cannot post a reversal through FB08.
Regards,
Ravi