Depending on who you ask... I'm no authority on the lubrication issues of the tranny... you are correct ... partially.
If you get your tranny updated, the missed neturals won't be such a problem, especially if you "opt" for the shift kit at the same time.
I've got Bobby Baldwins shift kit in my tranny, which is good... but looking at Jamies (I've removed 5 tranny's).... I like it better. I'm very sure John Jones also has something also.... very good.
The Lube issue doesn't have anything to do with the safety/lock up issue. The lock up issue delves from quality control when our tranny's were built. There is a little bit too much slop in the bushings, and not the right kind of clips holding the gears on the rails.
You lose a clip, because your gears are slopping around a bit, the clip drops into the rest of the gears and locks it up.
A few years back... someone in our community did a survey to find out how many failures there were. If I remember right it came out to around 1%. If this were a problem with any of the big operating companies now.... Kawasaki, HD, Honda, etc. .... it would have been a huge recall.
I don't know how else to tell you.... get it done, as pulling in the clutch when it happens will not save your life. That back tire, will be locked tight, at what ever speed you're going. Plus what ever else that gets damaged mechanically and estetically to your bike when it happens.
Here's a link for the removal instructions. .....
http://www.excelsiorhenderson.com/pages/tech/pdf/EH_Transmission_Removal_Guide_X.pdfbelow I've listed links for the shops that I know of that will help you out, plus Russ, who is by email
http://www.superxservice.com/Jamie & Marty Jones at Atlantic EH;
http://www.superxparts.comRuss at rdffff@msn.com
good Luck,
Bruce