Is this legal in pool?

No. The rule is something like "equip must be used the way it's intended". I do recall for bridges specifically there is also a rule only two can be used to stack on top of each other.
 
It depends. If playing under WPA rules, no.

"the cue must be supported by the head of the bridge."


1.4 Player's Use of Equipment

The equipment must be used only for the purpose or in the manner that the equipment was intended (see
3.16 Unsportsmanlike Conduct):
...
Mechanical Bridges — The player may use up to two mechanical bridges to
support the cue-stick during the shot. Only bridges similar to standard bridges
may be used. When using a bridge, the cue must be supported by the head of
the bridge. And if two bridges are used, the second bridge must be supported
by the head of the first bridge.


 
... Here is an innovative bridge approach from snooker. ...
Ronnie did the same in a long run when playing the three ball when he was badly treed by the five ball. ;)

As for the OP technique, I like it for its innovation and have used it, but was talked out of making it legal.

The Williams/O'Sullivan technique is legal, but not so useful at pool.
 
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