good effort...
a few things that occur to me. since we are using implied rules and effects here, it seems that a lyre in order to function properly would require the sound waves to be generated by the strings, to travel to the structure, and affect the structure. considering that silence can negate such music-based effects, it stands to reason that any sufficiently sound-warping effect would as well. thus (maybe) it requires an air space around the lyre and such air space has to touch the wall / structure it is affecting.
you can get a single non-epic true res effect for the cost of a single feat and some planar travel time. renewable at only the cost of the travel time. or you could just stand in the spot, i guess, instead of dealing with the travel time.... ^^
since we are wandering off into the wotc-didn't-happen-to-define-a-poorly-worded-rule-to-cover-that-whoops area, i would suggest that in while the travel time between circles might be instantaneous, the dwell-activation time for the circle is not. once the person arrives in the circle, it takes a moment for the circle to recognize this and activate. after all it takes a standard action to activate an instantaneous effect in many cases. examples of this are littered through the magic / psionics rules. so that would be say 60% of a round or so's worth of time. we'll fudge and call that 4 seconds. thus i suggest that there will be a lag of maybe 4 seconds between each teleportation effect. i don't think you can achieve quantum uncertainty. even in modern successful teleportation experiments, there is a dwell time of some fempto-seconds, if i recall correctly.
i'll think of more after a while... =D