Well in that case, the simplest solution would be to fabricate the pier with the tilt built in to the base plate (and webbing).
~c
Incidentally... making the base plate much larger than the pipe diameter reduces the overall stiffness of the pier, unless of course you couple the bolts to the pipe with (tapered) webs.
This is how NOT to do it:
https://stargazerslounge.com/topic/6...plate-adaptor/
This is an example of where NOT to locate the bolt holes... they should be as close to the webs as possible.
http://homeobserv.co.uk/product/telescope-pier/
best
~c