My first recommendation is to change the DBM from the Trophy Hunter/Axis Style DBM to the traditional style DBM for 10/110 series. With it, you will have more positive, reliable feeding and loading of the mag. ALso, it would work in the Richard's Microfit stocks and the Boyds Stock you highlighted. If you don't choose to go that route, you need to call Savage Customer service and tell them you have a TH and want a wooden stock. They will know the part you need to make the Axis Style DBM you already have work in the Boyd's Stock. IT's about $15. There may be another $2 part (lug/post?) that goes along with it, I am not sure.

The barrel channel in the Boyd's stock you highlighted would have to be opened up to accept the larger contour of a varmint barrel. It is not difficult to do, but it requires some elbow grease with sandpaper and a wood dowel or deep socket socket. I don't know for certain, but I don't think there is enough stock material there for a full bull barrel.

That's all I got. :)