While awaiting Mr. Yamaha's reply, I can hereby give you some feedback on some of the mentioned caps.
I installed some Clarity ESA in the tweeter circuits of Sony APM-33 and SS-X300, and they are quite clear and bright. In the first 50 hours a lot of SSS-ing and ISH-ing, afterwards they get tight(er). Not the best cap for a fast tweeter (when in the signal path), but they give a very spatial and airy sound that you may like (with a Vishay MKP1837 10nF bypass).
ClarityCap SA and Jantzen CrossCap are excellent low cost caps for anything parallel with the driver, but I wouldn't use them in series with the driver. Both have a certain darkening colouring effect (which some actually do like), and a little slow-ish when in series with the driver.
From that point of view, the new ClarityCap CSA may be the thing to try while maintaining a tight budget.
By any means, and when budget is not a problem, the ClarityCap MR/CMR are really good caps.
Don't rule out the classic Mundorf Supreme either for tweeters; a very decent choice.
Audyn Cap MKP plus is also a very good medium/woofer cap for medium budget projects.
yeah.... just got another box of 180 euros in speaker filter parts last weekend....money goes really fast in this chain's tail end