I'd suggest the encouragement rather than enforcement route. My youngest of three had zero interest in hurling in our nursery and always made up an excuse to dodge it once the 45 mins of football was done, helmet too tight, hurl to big, bib the wrong colour etc. I went with the flow and let him off.
I used to bring him out to the park and leave a hurl beside the goal and eventually his curiosity took over. Starting school was also a big help. When his class mates were playing both codes he quickly copped on that he was missing out on a match and a training session every second week.
I didn't brandish a big stick and it worked. Having retired from football once and hurling twice, he's now under 9 playing both codes and loving it. They usually get there in the end with a bit of direction and encouragement. No need to panic at this stage.