It turns out that my suggestion in post #9 of trying the small (Compact) Field Optics eyecups on the Trinovid was ‘sub-optimal’
Or to put it more plainly, just flat out wrong!
On the FO site it states that the Compact eyecups will fit eyepieces from 1.10 to 1.46” diameter (28...
It’s hard to fully appreciate just how slim the 7x35 Trinovid is, even in side-by-side comparison photographs
e.g. see some images in post #11 at: https://www.birdforum.net/threads/would-it-be-crazy-to-get-a-pair-of-7x35-retrovids-instead-of-8x32-hd-uvids.402128/
And specifically in relation to...