To answer your question. IMO it's doable. As a scuba diver and newbie freediver I've done all three sites.
Blue Grotto falls back more. It's not as vertical as Blue Springs. The general plan is to follow the permanent line down to the left to 100'. Loop around the breakdown pile and ascend from the other side. You basically swim a horseshoe. On the ascent you can stop and hang out in the air bell before surfacing. With more than 2 divers it gets a little crowded. I haven't dove there in years but know the water level is down quite a bit since then.
Another point is that Blue Springs is up for sale and recently received no bids at auction. I don't what the current status is but you may want to call ahead.
I wouldn't reccommend using the bell except for emergencies. On another note having had an experience with bad air in a wreck I wouldn't reccommend that either. Fortunately I just started coughing right away and didn't just go hypoxic.
As for Devil's Den I definitely wouldn't freedive in there. The vis. can be real crappy sometimes. Especially in the afternoon. It can be difficult to determine the surface from the ceiling sometimes and can you could possibly get lost temporarily. It's a really cool scuba dive with a good light.
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