Hi
As you probably know the Indian Government is making a strong push to free
themselves from the vendor lock-ins created by using non-OpenSource
products.
So, it is possible there may even be funding to help with this sort of
thing or there may well be some organisation, or conglomeration of
organisations to help with this sort of work.
Almost certainly you may well be able to find someone local who can do the
re-programming either as a one-off for just this Excel-Calc migration or as
a part-time employee/consultant to help with similar jobs in the future or
to help as 2nd/3rd tier in-house IT Support for any issues that may "crop
up" in the whole migration away from all the Microsoft and other
proprietary products.
One of the advantages of OpenSource is that you don't have to wait until
some profit-making organisation decides on the value to them of the help
you need. With an OpenSource program you can pay someone to do it for you,
on your priorities, or even have a go yourself. If your code is of good
enough quality then it might well be added to the main program. Many
organisations find that paying for a dev to work on their own issues is
still cheaper than paying licensing fees as well as giving them more
control. Quite a lot of the development of LibreOffice is due to many
organisations co-operating with each other in this way through The Document
Foundation.
Regards from
Tom