Run? As in keep as useful ready gear? No, certainly not. I have given a post sample Glock Switch a try on a Gen 2, 17. The first thing I will say about the infamous Glock switch is it requires minor but some modification to the frame, it also requires timing adjustment based on the auto sear trip, they are literally making these things in China so the QC depends if you have legally acquired one but many require the sear trip to be polished down to engage properly. You'll know its right when you hold down the trigger and hear that striker snap the last 1/8" of slide travel.
A full auto pistoll single grip pistol is fucking stupid to me, unless your some crazed assassin and you just want to magdump into someone 3 feet away, it's pointless. I got to test drive a post sample for about 30 rounds and said "WTF is the point of this"? As far as I know only the IDF used the glock 18 and they used it with the 5 minute install SBR stock. Because when they needed to raid an urban area for some reason it was like a favela in Brazil, bunch of cramped tight living situations. Tight corners no engagement past 5 yards even possible. I suppose glock 18 with stock and front grip is the lightest thing possible. Lighter and possible cheaper than an UZI or MP5.
I don't have ton of FA experience and I have no actual firefight combat experience, never even fired a shot at Haji. IMHO FA is novelty even in an M4, FA has two roles, 9mm SBR's for urban detail like police tactical work and heavy support weapons like the old M60.