Indeed, and you can get them here, on Ebay, from Kaidomain, Lumens Factory, and more. In fact, you should all get lots of them from Lumens Factory, before my resistance to the temptation of the new Seraph line runs out ("I already have too many hosts that need to be made into full lights," I tell myself). But, you have to get just the right parts, to do more than maybe 10W or so, continuously and safely, and those are not easy to come by, today. Plus, DIY dropin options are limited, these days.
As to the OP's HDS concern, sewing pins can poke at the plugs/glue, and start getting the tailcap open. There's not much to damage, unless you're exceptionally reckless. I've had one open because the retention cable got loose, and started coming out. Henry gave me some tip on how to bend the end, IIRC, and it's been fine for years, now. It can be serviced, if you really need to do it, and it isn't brain surgery.
IMO, the big question on HDS vs Malkoff should be your lows, if you want to go with AAs or not, and if you want pocket clips. Malkoff's will have a less throwy beam, with a lot of medium-angle spill, but no real low output. HDS lights will have a more traditional beam, and will go absurdly low. But, the AA tube makes the whole thing long, heavy, and bulky, compared to a 16340 or 18650, while MDC AA bodies are thinner and lighter. Pocket clips available for HDS lights just aren't as good, unless you get good ones and drill your own holes in the head, as what come with Malkoff MDC bodies. But, did I mention that the HDS lights will go to crazy low outputs?