I'm sorry to hear that. My nearby Toyota dealer was recently bought out by a much bigger company and the first thing they did was massively increase parts and service prices, got rid of the long-term, really experienced people, and are much less helpful now. The parts and service people used to be really helpful, try to save you money, and were even enthusiastic about helping you keep your old Toyota going. The linkage is about 3 times the price of the arm and a £ is like 2 Canadian dollars. Yikes!Caledonian Toyota is no longer, it is now under Jacksons IOM, i bought a wiper arm from them ( without the wiper blade ) and it cost me £150, so think the cost of a wiper linkage will cost more than my mortgage.
Amayama has both LHD and RHD wiper parts showing. It appears that the RHD part number is 85150-42040 which they list as "discontinued" Maybe you can find stock somewhere of that part. Many years ago, I was able to get an obsolete window regulator for a previous Toyota because the dealers used to be able to a "dealer search" to look at leftover parts in stock at the dealers across Canada and the USA and found one leftover on a shelf from a job that didn't complete. I don't think that they can still be that helpful though.
If all else fails, maybe the outer part could be drilled out to press fit a sintered bronze bushing to fit the shaft that you lubricate well and hope for the best. If the outer part is cracked or too thin, this may not work.