As to the mod, I'm noodling over a couple of ways to do it.
1. Leave the way it attaches to the bike and use a hinge at the hook end
and a quarter turn fastener on the latch end.
2. as above but with a release (of some sort) to let you open the hump
without removing it.
Which would be better for you?
Now to the handle mod... That took a little over an hour using patience
and a die grinder with a rotary file.
Take the hump off, remove the latch end bolts, loosen the hook end bolts...
Install the hand rail,
Latch the base and gently draw/scribe the front and back edge of where the
hump hits the hand rail.
Grind small amount off at a time and check how it fits, then repeat until
it fits without touching the hand rail.
When you think you've got it correct, put all the bolts back into the hump
and see how it latches, if it touches the hand rail, repeat the above
until you have a small amount of clearance.
I do not have any clear pictures of it right now, this is close...