When I get my project working, we will be able to modify DNA in adult humans, which is why the project would be such a big deal

It is. For a million, it is a steal.

the billionaire’s immortality research companies.

Give the Europeans a chance first to finance you. When it will be used for evil you don't have to worry because you gave everybody the chance to finance it with public money.

If you are generous you could also try doing a kickstarter. It would be interesting to see if the public is willing to finance such basic research on their own.

Good luck!