XF 2.3 Add link to custom field in message user info

[Mr Lucky]

Currently if you tick Viewable in message user info on a custom field, then the expected behaviour is that it shows the entire contents of that user field. What I want do do is (for certain user fields that my include a long list of items) just show the title of the user field as a link to the actual field in the user's profile.

Can anyone please give me details on how to set about doing this?

Thanks

[EDIT} I just realised this may be way beyond a simple customisation I would be able to do, not least because custom fields showing in user profiles don't have anchor links