If they would throw in a side trip to the Heard and McDonald islands I would be in for sure, but seems like a waste to skip it if one is already in the vicinity.
I know it is only a "jokey" comment but following it up has led me to a few points of interest which others might also find to be so!
a. I hadn't really picked up on how "relatively" close Kerguelen and Heard/McD are
i. Heard to Kerguelen 500 kms
ii. St Denis (Reunion) to Kerguelen 3399 kms
iii. Fremantle to Heard 4084 kms
b. So it would actually be a slightly shorter sail in terms of distance to reach Heard from Reunion than from Fremantle (3869 kms Great Circle missing out Kerguelen)!!! The Crozet and Amsterdam Islands are both closer to Reunion than Kerguelen is.
c. Heard and McDonald are both situated on the same geological formation as the Kerguelen islands - my knowledge of Plate Tectonics is probably much the same as most other non geologists with a general interest but, as a result of this issue I have now learned about LIPs ("Large Igneous Provinces") - which is apparently what the Kerguelen Plateau is!!
d. Having been on a very slow boat in the southern oceans I appreciate that even a few kms can be a "big sail". Our smaller Russian vessel had a cruising speed of 13 knots in normal weather - the Marion Dufresne does 15.7 knots apparently (Wiki) = 29.1 kms p hour. So that "little" extra journey on a World map of 500 kms to get from Kerguelen to Heard/Mc D is going to take at least 17 hours each way!!
e. It will be interesting to see what IUCN makes of the differences between the OUV of TAFF and the already inscribed Heard/McD. This article
from WWF treats all of them ( apart from Amsterdam Islands) as being in the same eco-region. With differences no doubt as between some species -but enough to justify a further inscription?? Heard/McD were originally deferred (1991) because of uncertainty about how unique vis a vis other islands they were. The IUCN evaluation
which eventually recommended inscription for Heard/McD went into some details regarding the respective values and common aspects of the sub Antarctic Islands which included Kerguelen etc -