Officially, Hitler was stateless (i.e. no formal citizenship status) between 1925 and 1932, which left him vulnerable to deportation during this time.
So let's say sometime during the republic's most turbulent years (1930 to 1932) law enforcement agencies are instructed to arrest Hitler with the intention to deport.
Where do you think he could plausibly be deported too? (minus Austria, as they had refused when Bavaria tried to do so in 1925)
What level of damage would this do to the NDSAP had Hitler been sent away at this time?