I've been thinking it over a bit more and I think the OP misses a fairly important point in the dicscussion Warlock 2 vs Warlock 3. You are not only trading the features listed but additionally a delay in sorcerer progression of course. Meaning that all the higher level spells will be delayed...
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Jeremy is quite a bit more explicit in these posts:
So although ambiguously formulated in the PHB, it's not supposed to work like OP describes. (although you could instead take the devil's sight invocation and end up with a similar result).
I'd say pact of the tome (+ancient secrets) and...
Hi I tried to create an account using a ...@yahoo.com address. Even after waiting a week, checking my spam and resending it about 12 times nothing arrived... As a nice added bonus I can't post for help nor contact the mods until my account is activated... In the end I remembered having a gmail...