Is there a way to sync bookmarks between chrome and safari on an ongoing basis?
The chrome extension "Xmarks" may serve your needs. The extension syncs bookmarks between computers.
https://chrome.google.com/webstore/detail/ajpgkpeckebdhofmmjfgcjjiiejpodla
seems to be available for both chrome and safari. Then if you use icloud sync, bookmarks "should" propagate to your mobile device. Changes on the idevice would propagate back to desktop safari. What is unknown, is if you would have to periodically launch Safari on the mac to get things in sync. NOTE that this solution runs on PCs only (Using a '.com' ap / program). If on Apple only, will work only if your Mac also runs Windows.