Its almost unfair watching you destroy Trollhemia like that, what are we going to do for a big final baddie? Completely unacceptable work.
Also now prepare for another Dauth brand maths spam (lets hope I don't screw this up, I've been writing and rewriting this post to make sense for about 45 mins now). Warning maths may contain *SPOILERS*!
Onto the BB issue you say 60 bb before 1650 (others reckon 65) and 94 to collect. This leaves 34 provinces at IMP or REV (see below for definitions). These provinces are more effeciently taken during REV era (half cost relative to IMP).
There are 56 povinces owned by natives in new world, at 0.8 bb each which gives 43.2 bb (call it 45 for ease) overall.
Your average bb burn rate appears to be 2bb/year meaning you have ~340 bb to burn. When we add Cabinet at about 1655 this number is closer to 500 bb.
Can you take the rest of Europe (and any colonies they spawn) while not spending more than 500 bb? There is some wiggle room here as you don't have to end on 0 bb.
Imperialism CB (Now called IMP) will be used until Revolution / Counter Revolution (Now called REV).
REV due at 1760 (assuming you give priority to Gov 53 which I'm postulating is likely).
IMP between 1650 and 1760.
BB burn in REV era: 60 years at 3 bb/year = 180 BB. 180 BB from REV = 180 provinces (34 of which must be from the former Holy War targets which leaves 146 European provinces)
We still need to deal with the BB from Pagans, this is best burned before REV arrives so 45 bb at 3 bb/year is 15 years of IMP lost to burning BB from the pagans.
BB burn in IMP era: 110 years (5 at 2bb/year, (105 - 15(Pagan BB) ) at 3bb/year) = 10+270= 280 BB from IMP = 140 European provinces
Total European provinces worth of BB burnable is 286
So assuming this is all correct (unlikely given that its taken me three quarters of an hour to write, and I've already fouled up basic maths in this thread once)
The million ducat question is. Are there more or less than 286 European provinces. I think that its close but doable and this doesn't take into account the 6 bb bonus from High score diplomats. The total number of European provinces that can be taken can be increased by going over 3 bb/year burn rate or by bringing REV foreward.