Is this read-able?

If not... how would you write it differently? (keep in mind- that's the most in-three part in the whole section)

Not much problem, if you take any pair of tied crotchets WITHIN a triplet group and put a minim in their place 🙂 Interested to hear the piece it's a part of (cello concerto?)

To me it is perfectly readable, however as a player I would maybe prefer sextoplet instead.

(PS: I'm not sure if this is proper term in english, however I mean 6:4 hemiola.)

Is that a cellist on the top line? Unconventional though a professional would read it as is. Cellists may not like you using the tenor clef too much. It may cost you a few beers to get one to play it.

It's on pink paper which one can only assume was supplied by the Financial Times!

I see nothing wrong with it.

I am not a string player so am not an expert on this practice but sometimes strings players have a way of re-articulating notes slightly even if they're the same note tied together (I heard this mentioned on the young composers discord server).  In order to make it clear that you don't want those repeated quarter-note triplets re-articulated I think you might want to write them as half-note triplets since that is, ultimately their true duration (in the 2nd measure of the 2nd system on the right).

12 hours ago, BritishCompositeur said:

Not much problem, if you take any pair of tied crotchets WITHIN a triplet group and put a minim in their place 🙂 Interested to hear the piece it's a part of (cello concerto?)

 

It is a reconstruction of an older material as a second movement to a Call for Adventure:

https://www.youngcomposers.com/t38585/my-first-work-for-a-full-orchestra/?tab=comments#comment-1186686387