let me clear up some misconceptions right away.
not all AIs are created equally. just because ST AIs can read your input and react very well doesn’t mean SSF4 comps do. just because a comp uses a perfect reaction doesn’t mean it’s a practical one, hell it doesn’t even mean it’s the best reaction even if human players could pull it off consistently.
second, just because a computer is resistance doesn’t mean that the pressure from a computer is the same as it would be from a person.
to answer your question though, yes it’s practical. but IMO, you’d be better off going to the training room and setting the dummy on auto block.
last thing I wanted to say: just like the poster above here just said, there’s a misconception from playing comps that plagues players who train using them. just because a comp does something, responds a certain way, or is vulnerable to something doesn’t mean a human will be. as a matter of fact, even if you find something works on one player, don’t assume it works on another. instead of exploiting the weaknesses of the char’s user, exploit the weaknesses of the character they’re using. that way, no matter who uses that character, the weight of their weakness will be on them.