Hi Mark, There are various government approved travel agencies, agents etc. for Indian Visa applications.I was travelling abroad in 2017 and had applied the visa through Riya travels. They are one of the many official travel agents in India and very helpful.please look up Riya travels and someone should be able to help you. there are government websites where you can check the list of the approved travel agencies also.
Very good advice has been written for you. If you stick to them, everything will work out. And I can also recommend you Portugal Residency-by-Investment from Migronis https://migronis.com/en/portugal-golden-visa. Perhaps this would be an interesting option for you as well.