retaliator sealed breech?

Hello again, hoping you all can help clear things up for me.

I am looking into buying a Retaliator for modding (I love modding stuff) but feel a little over my head with sealed breeches.

I have seen quite a few diy's on doing this, as well as kits from Worker, Artifact and Orange mod works. It seems the omw kit is the only sealed breech that is capable of shooting standard darts while the others require stefans only. Is this true, or are there others that allow use of standard darts? Any diy sealed breeches for standard darts?

Also, I would ideally like to still be able to use the stock retaliator barrel add_on attachment, as I would like to add a worker pump grip. I have seen this done using omw stg 1 2 & 3 on a retaliator by a guy on youtube that goes by "pwnd" or "psyksg" I believe, which I really like. Are there any other ways of having a sealed breach along with the stock retaliator add on barrel attachment?

Thanks a bunch!