I switched to bunk boards a few years ago for the same reason. It's pretty easy to do. Just remove the rollers and bolt in some 2x6 to span the distance between where the rollers were. I covered mine in bunk board carpet. It's actually no harder to move the boat on the trailer on bunks than it is on rollers. The boat slides very easily on the bunks. It helps that the bottom of the pontoons are pretty flat, not like the H16 which is banana shaped. I didn't need to angle the bunks down at the back end but thought about it before making the switch. What I do is back the trailer up to the waters edge. The tires just touch the water and the back end of the trailer overhangs the water. Then I push the boat off. Again, it slides very easily especially on a downward ramp. To get back on the trailer, position the trailer the same way, move the boat so the bows are lined up with the bunks, bounce the bows to aid with the lift to get them up on the bunks and then pull. I am able to get the boat about half way onto the trailer manually with little effort and then I attach the winch and crank it up the rest of the way. I don't dunk the trailer to keep the wheel bearings and electrical out of the salt water. Also, it's a steel trailer so salt is the enemy and I have sail bags, life jacket tote boxes and things on the trailer deck that I'd rather not dunk or have to remove.
I don't have any good close up pictures but I can get some this weekend if you'd like. I have some pictures in this thread :
https://www.hobie.com/forums/viewtopic.php?f=23&t=60678 but they are from a distance.