Since you have the seed, I've found something that may be working for you, OP.
Can you try to follow the steps provided here?
(You should indeed not use the online version of iancoleman website, insterad download it).
Then you'll have to check those addresses and see if you have money on them; for that you'll paste the address (starting with 1) to blockchair.com/
Manual method:
- Create offline version of
https://iancoleman.github.io/bip39/- Put in your MultiBit HD seed
- Set Derivation Path -> BIP32
- Set Client = "MultiBit HD"
- Copy all the address/private keys (click show more until you are sure you have more than all the addresses you ever used)
- Set Client = "Custom" -> Set Derivation Path = m/0'/1
- Copy all the change addresses/private keys (click show more until you are sure you have more than all the addresses you ever used)