Any "solutions" would have to be a universal application of the glyph in question. So if using IMAWAL to create a bridge is a solution here, then IMAWAL needs to be able to create bridges in all
APHEELSIK could poison the water and force it to come out.
The glyph just doesn't work like this, so no that one doesn't make sense.
IMAWAL could make a bridge.
Creating bridges actually sounds like a cool use of IMAWAL, but would probably break a whole bunch of things.
If a second, visible monster were there, you could WEYTWUT with it.
You'd need LEMMISI or BLUDTUPOWA to complete the combo, but I'd agree this would be a sensible alternate solution.
BYSSEPS or PISORF could let you knock over a tree and make a bridge.
You could CYDSTEPP over a gap.
Or hey, maybe BURNDAYRAZ could boil the water out of the lake.
None of these make any sense given the functionality of the glyphs. BYSSEPS and CYDSTEPP are self-buffs that have no effect on the environment, while PISORF and BURNDAYRAZ have never interacted with water; it's completely counter-intuitive that they would work differently in this situation.
This won't work; you'll be able to reveal him and swap places with him, but then you'll be stranded.