You need a lot of arm strength, and a hoof pick, to get those classics off of a shod hoof. The up side to that is…they don’t come off when you are riding, even if you go through a bog. The down side is you spend as much time wrestling them off as you did riding with them on.
A less trying boot (happier to come off without you requiring the arms of a blacksmith) would be a Renagade or an Easy Boot glove. Neither is meant to be used full time as a boot over a shod hoof, but they do come in handy in short situations.
Of course, our OP would then have to deal with getting off the horse to take off the “easier to remove” boots, and then we are back to the problem of remounting again. Thus the easier and most efficient suggestion to prevent paved road slippage is using the Easyboot classic boot. One can ride for years and thousands of miles with those boots over shoes and the boots never wear out. I swear they are made out of commercial truck tire rubber. They are that rugged. If the OP was riding every day, I would simply suggest she leave the boots on. The classics are meant to be left on - they won’t hurt the hoof, won’t create a sour environment for the sole, and won’t bother the horse in the least. She can then take them off once a week to clean the hoof, put iodine on the sole, and then put the boots back on.
OR…the OP could have her farrier nail on/glue on synthetic rubber horse shoes on her horse’s hooves. No slippage, no need for a boot, no need for caulks (which are BAD BAD BAD for a horse’s legs unless they are an Amish buggy horse (in which case they are still BAD but it is a safety issue on paved roads) or a foxhunter going out in all types of weather (notably bad weather) in which case they are better than a pulled tendon or suspensory injury from galloping over fences across wet/frozen/slippery ground.)
OR…the OP can have her horse shod in aluminum shoes. They don’t slip on paved roads. I rode 15 years of endurance and over 20 foxhunting with aluminum shoes and there were many times I galloped on paved roads, my horse(s) as surefooted as mountain goats. Used to horrify the other endurance riders who for sure thought I was going to slip and crash when I rode the paved roads. Never did. Those aluminum shoes stick like glue to the road surface. However, aluminum wears out like butter on hot corn-on-the-cob in the middle of July if the horse is ridden regularly. You will only get a reset if your horse has stood around doing nothing for all 6-8 weeks. Otherwise, you need a new pair at each trim. Sometimes, depending upon how much you ride your horse, you may need a new pair mid-trim. That’s when it pays to do your own farrier work.