Well, why not consider the problem the other way around :
- if you dive trimix on a regular basis, using the service of a dive centre, if they don't provide an analyser for you to check your mix, change your dive centre. That's what I do.
- if you dive and mix on your own : get an analyser.
Because with CCR, the bailout bottles might be filled for 5 years before the gas actually gets used. A lot can happen in 5 years. So I check them right before a dive to verify that what I think is in them, is actually in them.