dont 'repot' as such, but pot on. wrap the pot in a tea towel, and gently tap with a hammer to crack the pot and shatter it. Any pieces that fall off can be used as potting material for the new pot All the bits that stick to the roots are fine, leave them, and any cracks will soon be forced apart by the roots, and the terracotta can serve as potting material anyway. Sit the plant and what was the old pot in the new pot and fill in with any broken terracotta and some bark or S/H pellets. Make sure the diameter of the new pot is about an inch larger the whole way round than the old pot.

I know someone who has a Sophronitis coccinea 'Port Light' (his own creation), that he has had for years, and he has potted it on using this method-there are about 15 terracotta pots hidden amongst the roots lol Funny thing is, he hasnt filled in the edges of the new pot when he pots on, he leaves it empty