Adrian, tubeless "can" be removed by hand - it's just really really difficult, and it would help a lot to be very good at it with tube-type first.
Have a look at the thread "Flat Tire - Repair Kits" (just moved to this forum) at http://www.horizonsunlimited.com/ubb...ML/000082.html
I think you'll find what you need there.
Also see: http://www.netrox.net/~dali/prod/tirepair.htm
re: "you recommend tubed or tubeless for a two up BMW riding through Africa?" I'd run tubeless until I HAD to put a tube in because the tire is damaged too much to hold air.
Try not to need to replace tires until in a major centre. Even then tires of the appropriate spec may be hard to come by.
For two-up, we run a STREET hard-wearing touring tire on the back, this got us through Africa on the one tire. (Metzeler ME88 Marathon, no longer available, replaced by ME880)
A ContiForce on the back and an Enduro Pro on the front would be a good pairing. At least that's what I'm going to use next.
Remember that you aren't going to be doing any hero stuff in the dirt with a passenger and load of luggage, and the extra weight will probably more than make up for any loss of traction using a street tire.
See the Conti UK website for more info http://www.conti-tyres.co.uk/contibike/
Note that adding a tube to a tubeless tire decreases the speed rating by one.
Share the Dream!
Seek, and ye shall find.
Inspiring, Informing and Connecting travellers since 1997!