It is possible to share a single output queue per printer like illustrated below:
With the setup above you need to ensure, that the printer writer job is only printing spooled files with a specific form type called 'X' above. It can be any value, but it must be different from the form type of the input spooled files generated by your applications.
One way to ensure, that the printer writer jobs are ignoring any spooled files except one specific form type is to add a special validity checking program, STWTRCHK to the STRPRTWTR and STRRMTWTR commands via the InterForm400 configuration.