I put a link on all my listings to my Auctiva store front especially now that I have ditched my eBay store.
However I do word the link e.g. as 'view all my other items on eBay here' so hopefully it is over zealous eBay employee proof afterall this is an allowed link
I have now created a custom listing template to match my chosen Auctiva store front which adds a neat bit of consistency. It was not possible to match the eBay store listing customisations to the Auctiva store front. Branding very much comes from consistency of style.