the problem with copper tape is that it will not like the heat of soldering and may short things out (like in your 1st fix), i think you should try to get your hands on thin wires with insulation, like the cores in telecom cable, ethernet or phone cables, if you buy 1m you will get 4m of usable wire with the phone cable, and 8m with ethernet, so should be a pretty good deal overall, then you either let the insulation melt when you solder or cut a bit of insulation off with an utility knife and then solder (it is what i do).
what i think you should do is when you put a switch back in place you solder its lead to a piece of wire that will link to 69 and one of the low resistance ones to replace the broken trace, the wire do not need to be in one piece and can be soldered the way you think will be the easiest for you, you could even solder from 68 to a low resistance pad and 70 to 69 if you want.
and when i says low resistance i am talking the 1.4/1.3 ohms you got from the broken trace. and if you have leaded solder and a temperature controlled iron try to get your temperature around 290 to 310, should make it less likely to lift a pad, and if you plan to do more desoldering get your hands on a solder sucker pump, makes the job easier.
hope this helps.