Is any chance for just replace linux kernel of older buildroot Pi 4 image for Pi5

[Vichezo-72]

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Hi every one, I was working on the buildroot image building. Originally the raspi 1bp is used in our product, but we upgrade the PI to raspi3bp. So the software includes Qt and Python need to upgrade to new version for new version buildroot. But now the raspi5 is coming, I hope to change the hardware from raspi3bp to raspi 5. But looks need using the latest version buildroot and also the python and Qt version are upgraded not curretly I used. With new version Qt and python, some module and package not supported. All my software even the open source I used looks need much modification to working with new version Qt and Python. My question is any chance to easier change the rpi-firmware and start up files only, not necessary to build whole new buildroot image with new Linux Kernel. Could any suggestion for me. thank you in advance.

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