Upvote:1
None of this is possible. It appears to be a description of the UK system but the Schengen area does not work that way.
Generally speaking, Indian citizens need a visa in Germany even if they are merely transiting airside but your UK visa should exempt you of that requirement (see Do I need a visa to transit (or layover) in the Schengen area?). It will not be possible to leave the airport or to get a Schengen visa on the spot as applying at the border point is only possible for EU citizens' family members and emergency cases.