Without the lens , you dont have any options left to use.
The exploit on MC, you could use the Dev1 to boot, but only if you have the exploit in the BOOT folder.
well, there is this one app, but its very unstable and could screw up the HDD file system. I personally wouldnt use it, but some people have had no problems.
Theres PFS Explorer
used from PC like winhiip. USE AT YOUR OWN RISK!
If something goes wrong, your on your own, there isnt any info about this app.
I think you would do better to fix the lens or replace it. That is what i suggest first. If your only option is the app, then use a hdd you dont care about to experiment with.