he is using adapters going to a larger lug pattern, i dont think they make adapters going to a smaller lug pattern.
Honestly, 4x100 is not recommended for the size of our cars because the spacing on the wheels are weaker when holding a 4x100 compared to a 4x114. There are shops where you can drill the new 4x114 lug pattern into it but 1) you risk the chance of being off by a couple mm's and next thing you know you are wobbling all over the place cuz the lugs are off center and 2) you say there is alot of holes already in it, you risk the chance messing up the current lug pattern and messing wheels all together and the wheels just become one BIG paperweight