You'll need to do as much flying as is required to pass a Licence Proficiency Check. How many hours that is I can't tell you as it will depend on your ability. Renewing a type rating after this length of time requires no set amount of training or flying (other than the usual 2 hours in the preceding 12 months). So get booked into your local school and you could be up and running by the end of the day. However, don't be surprised if the school is reluctant to allow you to Self Fly Hire without a few flights with an instructor.
As regards sponshorship, other than the GAPAN scheme I'm not aware of any companies sponsoring at the moment. To prevent abuse from posters that aren't sitting around drinking coffee waiting for their shift to end
, you would be as well reading the threads at the top of the forum, and using the search function regarding becoming a professional pilot.
Best of luck with the bank manager, but I suspect that any loan would have to be secured.