Is there a way to do cortical evaluations without a loudspeaker?

The Eclipse can accept external triggering so this is an avenue you could pursue i.e. provide acoustic stimulation via the direct audio input and simultaneously trigger the Eclipse. Usually the triggering is associated with eABR and eALR (direct input to a cochlear implant electrode array) and so the Eclipse software has some pre-loaded protocols for these applications but there’s no particular reason you couldn’t use/adapt them to suit a direct input to a hearing aid or other device too.

The details of the triggering signal are provided in the “Additional Information – Eclipse” handbook.