You don't fly a speed, you fly an attitude which doesn't change with weight or any of the others factors you mention. Whats ground speed got to do with it? your in the air.
And yes to those tolerances can be done very easily in fact its not uncommon for 15 hour PPL student to be able to do it.
Maybe a SEP(cirrus) class rating is in order which negates the need for normal piloting/PIC skills. And just has pull the handle for any emergency actions.