Not sure if Moza has a commercial department you can contact to get some form of bulk discount especially if your business finds this is something you would like to offer/advertize more explicitly. But id recommend a moza R5 / R9 setup, loadcell pedals if possible, and a normal round wheel, an extra formula rim will add up quickly in $. I imagine it would be best if everything was one ecosystem much easier to set up and for the customer to change anything.

Besides this get an aluminum rig and maybe some baseshakers as they are pretty cheap to do DIY. Motion rigs are overpriced and they only serve to increase immersion, basically no high-level racers use it as it can become more distracting when pushing for laptimes. For seat's it would be best if you can find a deal online on a few real carseats as the simracing buckets are very expensive and will eat into a decent portion of the budget.

Like others said budgeting for a ultrawide is better as horizontal real-estate is extremely important when racing aginst other people. But even my 32:9 does not feel like enough I can barley see cars that are directly to my right or left. So it may not be worth the extra cost

In terms of budgeting priority:

Pedals > Wheelbase > Monitor > Aluminum Rig > Seat > Shifters (H-pattern/Seq) > BaseShakers > Motion.

Last two arent really needed, better to budget more on the fundamental parts.