When you say that you can't "use the Roadmaster for a car that has Honda Sensing," where are you seeing that?
I know that the Roadmaster instructions say "No Adaptive Cruise Control" but I'm wondering if that is a misprint. The reason I say that is I believe Honda relocated the Accord's ACC radar for the 2018-19 model years so it now shouldn't interfere with baseplate intallation ...I'm not absolutely sure but I thought I read that somewhere.
The Honda Sensing is standard equipment for the 2019 Accord models and since ACC is part of Honda Sensing, I'm not sure why Roadmaster is saying that. After all, they show an illustration of an installation on a 2018-19 Accord ...go HERE
But even if not, Blue Ox specifically says that their baseplates include installation with Adaptive Cruise Control. Therefore, if Roadmaster confirms that their baseplate will in fact NOT fit the Accord (again, they show a photo of one and all 2019 Accords have Honda Sensing), you can always install Blue Ox brackets and may be able to use the Roadmaster adapter 031-5 which "adapts all ROADMASTER Nighthawk and Sterling tow bars (with serial numbers above 14,500) and BlackHawk All-Terrain tow bars (with serial numbers above 16,500) to Blue Ox baseplates."
Call Roadmaster and ask them about it. My hunch is that they will tell you that their brackets will work ...or hopefully so.
(360) 896-0407 or (800) 669-9690
Or we can wait to see if anybody responds that is using a 2019 Honda Accord Sport as a toad to see what they did.