If you have a current home theater designer/dealer that sells Kaleidescape, you should continue to work through that dealership that can help you with these types of questions and additional support.
If you don't yet have a dealer, you could work with any of the ones that post here... look for ones that have been around here for a long time, made many helpful posts, and get good reviews from users here. I really can't/shouldn't steer you to one particular dealer, but the dealers here all have "Authorized Kaleidescape Dealer" badge on their profiles.
As for the list of compatible blu-ray drives... I'm on my mobile device now and can't really search for you, but I know it's been posted here... probably in the Hardware forum. Also, i know some members have posted some blu-ray players that were NOT on the official list but have now been shown to be compatible. If you can't find it or no one else jumps in to steer you, I'll try to search tonight and send you a link or two.
------
EDIT - here's Kaleidescape list of 3 compatible external players:
https://support.kaleidescape.com/article/Disc-to-Digital-Offers-Using-USB-Drive
i know there are more that have been shown to be compatible, but can't find those posts here on the forum at the moment.