Yes, since placeables.2da has a number of unused vanilla rows you could manually edit it and reassign this mod's placeables to those rows. Since your 2DA is borked anyway you'd want to start with a fresh install, so you could just edit the mod's changes.ini to switch it from adding new rows to editing existing rows. Rows 47, 62, 78, 90, 94, 97, 115 all have no models assigned and so can be replaced. Rows 8 and 9 are probably also ok to replace.