I find you can play around with the weschenfelder mixes. Just dilute them down with more meat than described in instructions. You can also cut down on the amount of rusk they state to use, even by half. I use a little breadcrumb as opposed to proper rusk. Instead of water you can add red wine, cidar or ale.. Depending on what you think will compliment the mix in hand.
Myself i make some lovely burgers using their rosemary and mint seasoning, paired up with water and lamb fat as well as the venison (in an amount more than stated to use) it made for a unique flavourful burger.. You could taste both venison and lamb and the seasonngs complimented rather than over powered.