I don't think anyone does this. The whole point of Transferwise/InstaRem is to send MYR, NOT Euro via M'sian banks!
So, send MYR to Transferwise/InstaRem, and they do the conversion to whatever currency you want, and deposit the money to your desired destination.
There's no TW receives Euro, there's no €25 charge, and they don't deposit to your TW acc unless you asked them to.
The money goes straight to IBKR after conversion.
-------------------------
on a side note, I think you don't understand how FinTech like TW and IR work.
Unlike conventional banks, they don't really send the money over.
Instead, they've funds in multiple locations. Their branch in M'sia receives your money, and their branch in other countries will send some money to your recipients. In this way, there are just two local transfers, instead of an international transfer like Telegraphic Transfers.
Banks can't do this because they don't have branches all over the world, and they are usually quite independent.
so what u saying is open a transferwise account, then use local bank to transfer MYR and keep it in the account. Then do a conversion to USD in account based on transferwise rate, then send it to IBKR?