I use PDF ReDirect from www. exp-systems.com and have done for years without any problems. I set my publisher set to print to PDF redirect then save from redirect into a single PDF file.
Not sure why you would be having issues just because you have a dwg merged into your project. Do you merge the survey straight into your main 'model space'? I put my surveys on a seperate worksheet, then put everything that is in the survey to a single layer and delete the old layers that came in with the merge from my layer list. Then I put the survey to the layout book as a drawing and overlay my 'site plan' drawing over the top of it. This works fine with my PDF printer. Hope this helps.
V12-V27, PC: Ryzen 9 3950X, 64g RAM, RTX5000, Win 11