Yeah, obviously please check the current situation with PCR tests and Namibia, but we had no problems.
Not possible to arrange insurance for foreign bikes in SA and Namibia , Cars esp. 4x4s I believe can be done - try https://www.tuffstuff.co.za/ I made extensive enquiries here and talking to several brokers, but a basic third party (physical injury, not property) is included in the cost of fuel anyway. BTW, you often need to buy road tax (eg Namibia but not SA) but that's done at the border.
Elsewhere we were able to buy insurance - at Katima Mullilo we got it at the very efficient border post, ditto Tanzania at Nakonde/Tunduma. I did try to arrange COMESA cover with someone in Lusaka, but it didn't happen.
BTW, although it's been a while and he may have moved on, if you go through Nakonde/Tunduma, which is mental, ask for a chap called MP to help, you may save a bundle of time with a group. I went through with a group of 4x4 drivers (long story, but they were great) and MP did a brilliant job getting us through quickly. Nakonde is a hole, we stayed down the road at a place called The King's Highway near Kalungu. Good campsite with rondavels, but no catering. https://tracks4africa.co.za/listings/item/w147560/kalungu-kings-highway-guesthouse-campsite/
In Zambia, Kapishya Hot Springs on the Shiwa Ngandu estate near Kasangala is a great place to stay (the hot springs are fantastic for easing aching bones!) ;D
[EDIT] Looks like Namibia is 72 hours now - sorry, it it did change while we were there, as of early November it was 7 days... https://travelbans.org/africa/namibia/
Current info sems to be:
Open for international travel via:
Airports
Land borders, except MataMata.
Health screening & COVID-19 protocols on arrival
Before arriving in Namibia, all travellers older than 5 years must take a PCR test within 72 hours from when the test sample was taken and upload it onto the Trusted Travel (TT) platform. Visitors will also be required to present the negative test certificate upon arrival in Namibia. Travellers with results from non-TT compliant labs must upload results to the Global Haven system. From 15 January 2022, only test results from the Trusted Travel platform or results that have been verified on the Global Haven system will be valid for entry. See a guide on how to use the Trusted Travel platform.
All travellers must complete the COVID-19 Surveillance Form before departing to Namibia.
Travellers are recommended to carry hard copies of all the above documents.
Undergo health screening and temperature testing.
Complete a short health questionnaire.