Although the back tools mod exists, it doesn't look very believable. Requesting a mod that either adds scabbards worn at the hip with the Baubles belt and/or chest slots and only shows the hilt upwards, or one that allows tool/sword models to be displayed at the hip either similarly to back tools or by placing it in an inventory slot. The former option would likely cause issues with modded swords, but offer potential for Thaumcraft/Embers addons to make magical variants of the scabbard(s). Latter option would likely be far easier, and lean towards being a purely aesthetic mod; though it would be nice if sword-type tools were always flipped around while picks, axes, etc faced up.
Apologies if this was a convoluted and/or unrealistic request, I know very little about modding.