My cat frequently gets roundworms.  Presumably from eating the stuff he
hunts at night (bad kitty :) )  He seems healthy enough but it is gross when
they come out.

I have been using the liquid wormer (I forget which kind but it is the
common type) and it basically works but unfortunately the cat tolerates it
poorly.

First, he simply won't take the dose calmly, he hates it and knows its
coming.  Most of it ends up on the ground or on me.  Whatever I do get into
him, he vomits up fairly soon and if I do get enough into him, I have seen
him gag or dry heave for as much as an hour once.

Is there any other way to deal with this other than an expensive shot at the
vet (how often would I need that anyway?)

Any tablet or pill remidy I can try. (roundworm not flatworm)

If not another remidy, perhaps you can give me advise on how to better
administer it (mixing with food will not work, he will pass up tuna or roast
beef if it is contaminated with medicine).  Usually I just tip his head
back, pry open his mouth and try to pour it in (pretty crude and only partly
successful).  I worry about getting it in his windpipe this way.  Due to his
lack of cooperation, he gets medicine far less often than he requires.