Would yew work I wonder? Taxus baccata is poisnous to animals so they may not eat it . Not exactly sure about being wet though

Sure I saw a site the other day that listed deer resistant plants - might be worth googling.

Yew will not tolerate wet conditions. Don't have any suggestions to offer though.

Specimen-sized plants are miffy when planted into less than ideal conditions. You get more success if you can plant them younger and let them think that this is normal...
Having said that, if it were me I'd try some of the less expensive options first, like Photinia, Prunus laurocerasus, even privet can keep its leaves in a mild winter.
Then if I had managed not to kill them, after a few years I'd plant maybe camellias, variegated hollies, rhododendrons, hoping that the more established cheapies would take the brunt of any issues from the field.