Am I able to submit an idea for a patent and then have a service that involves checking the originality of the idea / probability that it can be developed without interfering with other similar existing patents?
It seems like one question but you are asking two questions somewhat twisted together.
One question is how do you assess the chances of getting a patent on your clever concept. People usually have a novelty search on the clever concept done by a professional searcher or work with a patent attorney or patent agent who might do the search in house or might subcontract with a search company. A searcher can find things and send to you but not give an opinion. Of course the patent office will also do a search as part of deciding if a patent is deserved.
The other question is if you ship your complete product - clever parts and ordinary parts - will the the complete product or some part of it infringe on an in force patent. For this you need a search called a clearance search or a freedom to operate search on all aspects of the shipping product, not just the part you think is clever.
The two answers are complete separate. It could be yes/no, no/yes, yes/yes or no/no.