For more info on Dazzos you can do a search in the amplification section of AGF. I think there are as many pickups brands/types out there as there are strings including fans of each.
You do see a lot of K&Ks. I'm going with Dazzos as they have worked well with my other guitars, but plenty of other solutions out there. I exchanged emails with one HG owner who had a K&K UST for each bridge and a K&K SBT spread across the two bridge. He ran each into a volume control in the guitar and then wired them all together inside the guitar.
You can wire each K&K mini to a stereo end jack. The disadvantage would be finding a TRS replacement cable when you are out playing would be difficult from a fellow musician so you need to carry a spare TRS cable with you. You could run the TRS cable into the power mixer, using a stereo to mono cable breakout unless the mixer could handle a stereo signal. In fact I was considering buying a powered mixer as I only had a single channel preamp, but was able to trade in my single channel preamp for a dual channel preamp from Sunnaudio for a little more $. This simplified my setup as the preamp as EQ on both channels, can accept a stereo signal from a TRS cable and can mix the signals. The one thing you need to be aware of is if the mixer had the correct input impedance.
With your Timberline you could always use a stereo to mono adapter to a single TRS cable. I don't like two end jacks.