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Ebay may automatically block your message from sending if you try give bank details
Probably not now that there's a transaction between them.
@CasualLime it should be possible for the seller to offer a partial refund (I just did this for postage for someone that bought two items from me) but understand that your seller may not be able to figure this out on ebay. There might be a possibility for you to request a partial refund which they'd just have to accept. Otherwise, I don't think there's much someone can do with your bank deets.
Ive given bank details before on pinkbike and fb and had no problems
Ebay may automatically block your message from sending if you try give bank details