You're right about the potential outcome in the pastel x spider pairing.
I would honestly recommend you to buy a 1.0 bumblebee and a 0.1 albino instead - it will save you a lot of time.
I assume that you're thinking about a pairing between an albino and spider. If that is the case then all of the offspring will be het-albino and some of them will be spider het-albino.
The same thing goes with the pastel and albino pairing.
Once you've got the offspring from those pairings then you have to raise a 1.1 spider het-albino or 1.0 spider het-albino and breed it back to the 0.1 albino (its mother). And if you're lucky then you're going to get an albino spider.
And the same thing goes with pastel and albino.