Sounds like you're on the path to put a spotting scope to good use then.
A good one will weigh a few pounds, no way around that.
But the tripod and head on the other hand is where major size and weight can be saved. Of course you gotta pay to play. Carbon fiber legs save a lot of weight, twist locks save space, but flip locks save a lot of time when setting up. I cannot stress enough the benefits of a good fluid head.
One thing nice about a spotter and good tripod setup is that you can at least entertain yourself at night looking at the stars, planets and satellites. I keep mine set up on my back porch year round for this.