If I understand correctly, the trike gear airplanes have the CG between the main landing gears and the nosewheel. If you want to tailwheel it, the CG has to be between the main LG and the tailwheel. So either the LG block moves further forward or the CG moves further back for a taildragger. That is why I said dont do it.

With regards to reinforcement, I would use triangle stock to glue every thing with epoxy and fillers (or talcum powder, if you fancy ) mixed into the epoxy. Especially analyse what would happen if you had a rough landing and where the forces of the gear would travel in the fuse and add formers wherever you reason the forces will go.

Ameyam