Listing all the possible numbers is not completely unreasonable - it makes sure that the PBX presents only numbers that are known. Many SIP trunk providers do that, so that they don't have to worry about SPAM calls from customers. The flag in the screenshot above actually controls weather the PBX will rewrite the From-Header to the first account identity or the one that was presented.
If you want to keep the from header the other option would be to do a trunk-to-trunk routing where there are no extensions involved. This would be similar to connecting branch offices, see https://doc.vodia.com/trunk_branches.