In the informal talks leading to the seminar, tell them that you would like to apply for a faculty position in the near future, in a year or two.
It will be of mutual benefit if you already address the funding parts, so you can propose to collaborate in bringing in some grants, rather than going there full of requests but with no concrete plan of action.
The seminar after all will be an excellent chance to show all the interested people the research you have been involved, however having slides explicitly "nodding" at the department and future work to be done there by you would be more of harm than anything else, I would perceive it as patronizing.
However, gentle and subtle hints at possible collaboration, to be then discussed informally/orally and in follow up communications would be helpful.
Again, you are proposing some research activity, you should also be able to propose the funding mechanism or the possible industrial partners, and you are expected to do the work on your resources, do not expect much support: everyone wants to jump on a moving train, no one wants to build the railway.
If your future faculty position is as advanced as a train almost ready to start, you will have a better reception for your planned goals ...