Having a US title should be a positive.
You may wish to have the bill of sale available in case you plan to register the bike in Maryland from Texas. There maybe little or no tax due at registration. Also to change state to state registration you may have to be present to sign the title, but that varies from state to state.
I am not sure about a third party picking up the bike. But it being US titled should be easier since it is not being imported, it is just being returned. Also get insurance on the bike.
Isn't the UK plate issued for life ? Meaning once you return back to the UK one can just put the plate back on.
MVA Home Page
Maryland Dept. of Motor vehicle.