If you like that sound, it might be worth a shot. It will at least sound more natural than recording an acoustic direct. I prefer a condenser a bit farther away, usually an LDC like G650 but SDC's sound great on a lot of recordings. If you are doing a lot of fast or delicate picking, SDC around the 12th fret is a good choice. It depends a lot on the guitar, the room and what you are playing. I usually have to listen to 2-3 mic's before I decide what I want to hear, and then move them around a bit. I have no idea about that attachable condenser, it might be good but it seems like it also might not be very versatile. Those recordings have a lot of reverb which is irritating.
It was very challenging to mic an acoustic until I started to understand what to listen for when positioning the mic. I'm only OK at it now.
I forget where you are Goredho, but having a gear rental shop nearby is a great resource. I've rented a ton of mic's from RnR in Austin, sometimes just to try them out and see how much better a $1000 mic would sound over a $2-300 one. Like any gear, mic's can become a bit of an obsession since they all sound different and add different things in a mix.
C414 is a classic, I think the more recent revs (XLII, XLS etc) after 2000 are a bit hyped on the top end which sound overly bright to me. The prior models (EB, B-ULS, TL) can be found for around 900-1k used, so they aren't super entry level but they also don't really lose value. The guy who recorded my band's first album almost 20 years ago favored this mic on acoustic, and I am still trying to get a sound as good as he did back then.
I am a fan of a company called 3u Audio, I have 2 mic's from them and will be purchasing another one this year. The factory is in China, but they ship/sell out of Australia. The components are much better than you might expect from that type of outfit, and the owner/engineer is very helpful, he even listened to some clips of my voice to give an opinion on which mic would sound better. Their Warbler MK1 mic sounds great with acoustic guitar and even sounds good in comparisons with a U87 I have heard.
A site I found helpful is https://www.audiotestkitchen.com/ which has a shitload of mic's they have used on a few songs of different styles. It lets you load up some mic's and swap between them and solo out guitar/voice/whatever. I played with it for a couple of days and got a better feel for what kind of sound I liked.
I think you should have at least one condenser mic in your room. You can mic your guitar cab with it and add some depth to your tracks as well. If you are happy with your sound, I won't tell you to change it, it's working. But I would recommend spending the money on a good LDC to have around rather than a mic that you can really only use for close mic'ing the acoustic.