Trying to avoid buying and hauling another tripod. Surely someone makes a multi-mount Arca type extended plate like the MUB Wing only with a tripod mount instead of a pic rail. I have looked on the different camera sites until my eyes glazed over.
Might consider an Abel table...
https://abelcousa.com/collections/all
A lot of guys are starting to use them for what you describe, plus you can shoot off of it with a bag as well...
It has a 3/8-16 center hole for mounting to a tripod as well as the Arca rail for tripods equipped with a ballhead/leveling base. the additional MLOK slots and 1/4-20 holes and QD sling holes allow for a plethora of mounting options...
@hic28 can provide additional details and photos.