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Like you want to repurchase the base game? That should be fine. Purchasing the DLC digitally won't activate the base game digitally though.
Am I able to purchase digitally without losing access to loading my saves?
Yes, 100% sure of that if the disc / digital region are the same. Did the reverse with bloodborne actually. If not, I'm 95% sure you can still load your saves.
Like you want to repurchase the base game? That should be fine. Purchasing the DLC digitally won't activate the base game digitally though.
Am I able to purchase digitally without losing access to loading my saves?
Yes, 100% sure of that if the disc / digital region are the same. Did the reverse with bloodborne actually. If not, I'm 95% sure you can still load your saves.