Have you tried the "chip and dip" method?
Take a few pieces, 6-8, of the dry food, dip them into the wet food. Put them on a plate for Snickers to eat.
Or sprinkle a few pieces of dry food on top of a bit of wet food.
See if Snickers will eat a bit more wet food that way.
Have your tried a different flavor of wet food?
My dry food addict cat loved the Fancy Feast Turkey & Giblets classic pate flavor. Or the Chicken & Liver flavor.
Or perhaps a different consistency or style of canned/wet/pouched food?
Some cats like a more chunky or shredded consistency. Some like a bit of sauce or gravy on their wet food. There are low carb cat food options that still have a bit of that gravy consistency and would be ok for a diabetic cat.
Where do you live? We'll try to come up with other food ideas for you if you live outside of North America.
There is a lot of information in this document about
Transitioning a Dry Food Addict to Canned Food
I used every single tip and trick in there to get my finicky dry food addict to eat the canned food.