Sounds like you are having more fun than the law allows...
I wouldn't mess with landing pads; just build the d***n hinge already. I know you want to.
I routinely step on the cuddy top. Seems to handle it fine. You could always add a stringer.
Aiming: it'll improve w/ practice. I haven’t been off by 8" in a long while and often nail it on first try. I rarely correct from below. It's usually sufficient to take a peek and then adjust from above. However, the incline on the boat ramp factors in my muscle memory so I 'm not quite as smooth when sailing from some other spot. you'll get there.
Using a hinge, I get to stand in the cockpit. You're tall enough for that.
The preferred way for me to step off the trailer is to sit on the cuddy edge, put my legs over and slide down. All safely forward of the trailer axle . . . But I also have the trailer hitched for anything like that. However, as you report, once stepped the mast is not going anywhere.