Given how expensive getting piers made seems to be, one option I've thought of is ordering some pipe cut to length and making it myself. The following works out at about $110 and I can pick up locally on a Saturday.
Flat Bar (200 x 10) Length: 200mmx2
Pipe Medium (150NB Med Blk (165.1 OD x 4.8)) Length: 1400mm
Can anyone see any issues with using this?
I'd weld a piece of the flat bar on the top and embed the pier about 500 mm into the foundation concrete block. As far as the adapter for the AZ-EQ6, I just thought I'd re-purpose one of the Skywatcher pier extensions.
I'd have to buy a cheap arc welder + accessories, but they aren't too expensive (Aldi is even selling them next week
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I'd prefer a bit larger diameter pipe, but that seems to be the largest the vendor has listed (though I might ask if anything else is available). Still, I think it should be pretty stable anyway, especially if embedded in the concrete. It would be pain to remove if I ever wanted to upgrade (especially since an observatory would be built around it), but I guess an angle grinder should be able to remove it eventually.