Hi Martin,
Whilst I'm not 100% r.e. the frequency you are referring to (6x per day??), the general rule of recovery is - ARE you recovering? This is completely subjective for any part of the body which is receiving a lot of stress (e.g. wrists) but also recovery in general (e.g. how tired/lethargic you are feeling and how motivated).
My suggestion is always to start at the lower, more conservative end of volume and then increase SLOWLY over time (e.g. handstand practice 2-3x per week with the other work you are doing, then if this is okay after 12 weeks then you can try HS practice every second day.
When you also have a lot of projects at the same time with similar stresses (e.g. on wrist), HOW you WHEN you practice also makes a big difference. For example, VOLUME is the big killer for the joints. If you keep your HS practice submaximal in terms of wrist/forearm "pump" and likewise with Groundwork/Locomotion projects, and if you split them so that they are not all on the same days or too close together, this makes things more sustainable.
Lastly, adding dedicated, supplemental prehabilitation. Daily hanging & wrist-routines are the minimum "daily bread" here, however it's also worth 1-2x per year to invest 6-8 weeks of practice with open kinetic-chain complete forearm-development, 2-3x per week (see https://www.movemorevrl.com/videos/forearm-development-tools). Practice one variation for each range (e.g. 1 drill for extension, flexion, pronation & supination & radial & ulnar deviation).
Ultimately the objective here is not just to prevent injury, but to push your volume threshold higher (i.e. that you can do more on the hands, without overloading them). Think of it like this - someone who is used to running might run 5k every second day with no problems, because they have conditioned over time. If a newbie did the same, however, they would likely meet injury very quickly. BUT - if the newbie starts slow - just 1k every second day then adds 1 k every 2 weeks PLUS added prehab, they will push their threshold higher, and eventually be able to run the 5k every second day with no problems.
So, to reiterate, "too much" is completely subjective. The better question to ask is how much do you NEED (i.e. to make progress) and WANT (i.e. how important it is to you) to practice things like Handstand and Groundwork/Locomotion. From there, learn "where you are" at this time, and then determine what you need to do (e.g. less for now + added supporting prehab work) to get you there.
Ultimately the name of the game is SUSTAINABILITY. Wrist overuse will complete halt not only HS practice, but your Groundwork/Locomotion too - so, avoid it at all costs. Better to start less and increase SLOWLY over time (time being the years, not the months).
Is that all clear? Let me know with any further specifics my man!
With titanium foundations,
J