Wanna chime in here as I recently did precisely what you are considering doing. Firstly, I want to say I’m glad the taping bug has bit you, and that my old DR-40 served you as well as it did me.
I asked nearly the same question here in November or December, and I got many of the same responses you are getting here. The AT4031 was my first pair of SDC mics for taping, and they do sound quite good, and I did think the tape I pulled was listenable, even bordering on great. But there were two downsides: 1. There were others in OTS with MUCH nicer mics who made what imo are better recordings so I patched off them for the rest of the run and 2. Full bodied mics really are significantly more cumbersome to set up on a stand than smaller modular systems, and I do value less hassle during setup/takedown plus I spent more time worrying about my mics on the stand wrt weight.
So I sold them a month after taping with my first rig and just saved up for the Schoeps that I wanted, as Noah has said here. From personal experience I am 100% in agreement with him here. It isn’t meant to discourage you at all - I know firsthand the experience of owning your first pair of taping mics and the excitement of sticking em up in the air for the first time. It truly makes you feel like a legitimate member of the section with your own first full rig. BUT we are all more than happy to give you patches, and continue taking notes and listening to different mics to decide what mics you actually want to end up owning. Otherwise you will always look at the more expensive mics and wonder “how much better can my tapes sound, if I dump more money into my rig...?” In retrospect the AT4031 rig I bought was 1/6 the cost of my first pair of Schoeps caps, which when I looked at it that way I realized I should have just stashed aside a small chunk of each paycheck and reserved it for the caps I eventually bought, to save time and money. Yes I could have - and did - just end up selling everything I bought here on YS, but I could have saved myself lots of time and hassle had I just yielded this admittedly unpopular and seemingly discouraging advice.
Now that said, if you are planning on going to shows where you are the ONLY taper, there is nothing wrong with getting a cheaper pair of SDCs in the meantime just to have something to record the shows with. Alternatively, get networked in your local team board here and start talking to people about shows you are planning on taping; many of us would love to go to a show just to tape and be part of the hobby/community.
For the record, you are welcome to patch off my mk21s at Tahoe and if you make it out here Curveball.