For me, there are two types of "commemorative coins":
1. Those which were intended to circulate, made by the millions, and were frequently found in circulation there in the country that issued them. German 2 mark coins are excellent examples of this category. They
all commemorate someone, so logically they're all commemoratives. To my mind, collecting these "circulating commemoratives" would be an essential requirement for a "complete collection" of circulating coins.
2. Those which were issued only for sale to collectors (normally for much more than the face value stated on the coin) and never intended for circulation; you would only find one of these in change if someone's coin collection had been stolen and spent, or hard times came upon that country and the coins entered circulation by necessity. Most US commemoratives fall into this category, and some countries have only ever issued coins like this. For me, it's perfectly OK to not include these "non-circulating legal tender" (NCLT) coins in a collection, and still consider the collection "complete".
Another factor to consider is: banknotes. Find out what was the lowest denomination circulating banknote. If it was the same value, or lower, than the coin, then it's reasonable to assume the coins were not intended to circulate.
So, which class are these Austrian ones? The mintages vary between 7 million and 300,000 - numbers which seem to me to be way too high for NCLT, yet not quite high enough for a proper circulation coin. Certainly the first two (1928 Schubert and 1929 Billroth) I would class as circulating commemoratives. The rest, I'm not so sure. The lowest Austrian banknote at the time was 5 schillings, which would have made these coins the highest value circulating coins without a banknote equivalent.
You could always compromise, and only collect well-worn, heavily circulated examples of these coins, to "prove" they were in circulation. Much cheaper that way, too.

Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis