Homebrewing - Beer, Mead, Wine, Cider

Being a total newbie in kegging, I recently bought some used soda kegs for cheap. Not knowing what to look for, these kegs later turned out to be of the CC variety. While this is not a bad thing per se, most accessories like the cheap Kegland spunding valves etc. only come with NC fittings, leaving me with the question of whether I should convert my kegs to Jolly kegs (from what I've read, that's basically a CC keg retrofitted with NC style gas & liquid posts).

Apparently, you can't just buy the cheap posts from Ali Express, as they have slightly different threads and/or shaft lengths, so I have to go with more expensive ones. These particular ones were recommended in a forum elsewhere and are reported to work. I'm willing to pay that price if need be, even though the cost for the modification is now about 50% of what I payed for the kegs.

One thing still bothers me though: On a CC keg, the PRV is integrated into the gas post, so it doesn't have one in the lid. Do I have to buy new lids (with PRVs) now as well? That would make the whole conversion completely uneconomical. Also, I'm rather unwilling to test my luck by pressurizing one of the kegs so much that the PRV should be triggered.

Happy to hear if anybody ever did something similar.