Hello,
If your cat is going to be on this long term then I recommend you ask your vet to give you tips and a demonstration on how to pull your cat like the pros do.
Otherwise you can try to crush and syringe it, but it still tastes bad and they are still going to hate it. I also fear that mixing it in food or food and syringing makes them adrift or adverse to their food which can make a sick cat even sicker.
There is just no getting around learning how to pull your cat. There is a learning curve but eventually they figure out that it isn’t so bad and allow it without prejudice.
For cats with constipation issues I recommend a high quality canned food only diet and lots of exercise. If you are worried about pain please talk to your vet about safe options for cats. There are not a lot of them.
Thank you. Since we’re dealing with several other health issues my cat has been less mobile, which I know was part of the problem.