Sorry, no.
Any accessories that incorporate a Lighting Connector are not compatible with USB-C. Lightning and USB are completely different interfaces - and an interface-converter from one to the other does not exist; it’s not a simple case of finding a “plug adapter”.
Third-party accessories that feature a Lightning connector, under the terms of Apple’s MFI Licence, unless they offer generic functionality (such as a microphone) are also “keyed” to a specific third-party App. As such, proprietary devices can only be used with the corresponding App.
In summary, if you wish to continue using third-party accessories that have a Lightning connector, you will require an iPad/iPhone with a Lightning port.
I hope you find this information helpful in informing your future iPad purchase.