Sam,
Would you be able to load the remainder on a second remote?
Yes.
But would an engine unique on remote 1 address (say #30) respond also when remote 2 address #30 was accessed? Thus two different engines would respond due to address #30, the one you wanted and one you didn't.
That's correct.
Thus two different engines would respond due to address #30, the one you wanted and one you didn't.
Yes, so just have the one you want to run getting power and the other one not getting power.