What brand and style are your hubs? Some brands of wheels are convertible from QR to TA with a change of end caps, which would allow you to choose the fork presently offered. If you have a straight steerer fork and the new one is tapered you would need a new lower headset cup that's going to raise the front end a little. A new gravel fork might be a little longer too since people have wanted more tire clearance.

But I think if I were trying to keep this bike in service I'd go for a decauleur type bag instead of trying to install low riders