No first hand experience, but I can tell you that yes, getting the Indian visa as a citizen of Pakistan will be a major hassle. The Indian High Commission in London is not very informative, but the Consulate General in Toronto has a good page that outlines the process:
Please click on the link
http://www.india.org.pk/Sponsor%20Certificate.pdf for Sponsorship
Certificate. The sponsor in India would have to download this
Sponsorship Certificate and get it duly attested by one of the Indian
authorities as mentioned in the Certificate. It should then be sent
by fax/e-mail or post by the Sponsor in India to the applicant. The
details contained in the Sponsorship Form will be used by the
applicant to complete the online Visa Application Form.
Fill in online visa application form at http://indianvisaonline.gov.in/visa/. Take a print out of the visa
application, paste a photograph and put your signatures at the places
marked on application at its first and the second page.
In addition, application times are quoted as 7-8 weeks by the High Commission in London, and per anecdotal evidence, visa denial rates are high.
That said, if you have a corporate sponsor and a solid reason to go, I doubt they would deny you the visa -- you will just need to start the paperwork very early.