A: Yes. Using OpenIV, you can edit the catalog.xml and shop_mpchristmas3.xml inside the dlc.rpf to force holiday items year-round. However, this will get you banned in GTA Online (never mod online files).
This is the essential tool for GTA V modding. It allows you to open, edit, and manage .rpf files. It also installs an ASI Loader, which is required for the game to read custom DLCs. Update X64 Dlcpacks Mpchristmas3 Dlc.rpf Download