Bill,
I wouldn't worry too much about using the beavertail forend on your gun. We have all read the opinions of those who like the splinter forend and those that favor the beavertail. Most collectors of British doubles claim to prefer the splinter because it is traditional and is supposed to help you shoot driven birds better or some such. With a rifle we are talking about pinpoint aimed fire and I personally think the beavertail gives me more control. Your best bet is to do as you suggested, try both, and just see which one you like best for your shooting style. If the beavertail didn't work, they wouldn't be putting them on so many new double rifles. Bob