I've kinda dabbled with chastity cages but never that seriously
Am not sure what the one you've been considering is like, but I guess the short answer is, from what you describe how you intend to use it, that I suspect it would probably work.
You might not get the greatest experience if the design doesn't fit that well.
But if you'll only be wearing it for up to a few hours, and it doesn't cause any pain/injury during that time, it should be good enough and worthwhile.
I've bought 2 chastity cages so far
The first was a cb-3000:
https://www.amazon.co.uk/CB-X-CB-3000-C ... 002ZCXT2C/
Looking back, it was an awful cage and expensive for what it was.
It was also relatively complicated with a lot of parts (different sized spacers, lots of ring options etc) - although that was sort of the main benefit, it was pretty adjustable and after choosing the length a sort of one size fits all.
But, in a similar way to what Grimm said about multiple parts, that was it's flaw - eventually the cage split right down the middle on the top.
Having said that, it was a useful introduction, I learnt how they work, got an idea on what it was like etc.
The second one I got was a cheap-ish mass produced metal one (probably made in china) - this was much better, though still not that brilliant - I forget where I bought it from, but it wasn't amazon, but it was similar to this one:
https://www.amazon.co.uk/LOVONE-Penis-C ... B09B42TYWZ
The metal and the open design was great as it is easy to clean - it's stainless steel and doesn't rust
It was much simpler - 2 parts the ring and the cage (no spacers like in the cb3000) - it came with 2 ring sizes, one was definitely too small and the other was about right
In hindsight and from what I've learnt, the size I went with for the cage was too long, but it's still fairly practical, and I can wear it for a reasonably long period of time
Neither of them were resin, and I might consider a resin one next
On the other hand, I might try another cheap-ish metal one next - slightly smaller and slightly different design. Then maybe I might think about one of the more expensive resin ones like kink3d or cherry keeper after i have got a bit closer in terms of working out sizing
Have learnt quite a lot from reddit subs - the chastity training one has a lot of good links - of course be aware that posts here will often contain pictures of users' cocks in chastity cages to showcase purchases or to ask opinions from other users of the subreddit
https://www.reddit.com/r/chastitytraining/
https://www.reddit.com/r/chastitytraini ... lmost_all/
https://www.reddit.com/r/chastitytraini ... ing_guide/
There's also
https://www.reddit.com/r/chastity/ which is very active with useful discussions - there are quite a few other subs on reddit too with varying levels of activity and some focusing on different perspectives of chastity
Trying to get the sizing right and finding one that fits well is something that is very rare to get right first time, so unless you're very lucky, and especially since you're trying to save on cost, you're probably going to find it's not the best fit.
However, you should be able to get a reasonable experience and assuming it's something you want to continue with, you may find you'll be prepared to spend a bit more time/money getting something better in the future
Wary that this is a lot and probably way more than you need at this stage, but assuming you do buy the one you're looking at (or something similar), some of this may be useful after you've tried the cage over the course of a couple of weeks/months of short term lockups