Just spent a bunch of time finding and comparing especially micros that one can get in Europe myself. I only found two sensible*, readily available powder sources that aren't from the UK:
Planted Box and
Aquatic Landscapes. Not sure whether the AL powders are just the same ones available from PB because they also carry the PB kit, but they sell the individual powders under their own brand.
AL is "fairly" close in composition to Burr's mix, at least compared to other micro mixes that I could find. PB doesn't answer my mails asking for their micro composition and only had liquid micros available when I was looking to place my order, so I went with the AL dry ones. Haven't received them yet, though.
For UK soucres,
Solufeed TEMag seems to be the most promising of all EU micros I could find.
*I plan on keeping shrimp, so I want to stay well below 0.01 ppm Cu when at 0.2 ppm Iron, which most mixes overshoot. If that's of no concern to you, I've also found the German Yara lineup:
Vita Tenso Cocktail,
Tera Tenso Cocktail and
Trace Tenso Cocktail, which, ironically, does not only contain traces. And there are also the other Solufeed (UK) products, which have been discussed some on the UKAPS forum:
Tec Sodium free and
Tec Coir.
For your convenience, I've got a color coded spreadsheet
here. Do let me know if you have found any better alternatives!