I do not see a version of openwrt supporting P1022, but please double check with openwrt support.
P1020 ans P1022 are quite close, but based on different silicon so minor changes in software may be required.
We do not have any experience with openwrt porting here, in online technical support, so I can not predict the amount of efforts required. If you want to run openwrt without any modifications, please consider using P1020 or P1024.
Have a great day,
Alexander
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