I think the best solution is just to buy two SIM cards if you think you're going to use more than 10gb. Hard to do with eSIM
I have certainly seen people doing this, generally they are people who struggle with technology.
It has its drawbacks, see below.
I travelled to Hong Kong (from Aotearoa New Zealand) for a friend's wedding. I travelled with an elderly friend who struggled with technology. She had a Smart Phone that only allowed for a single SIM card. When we got to Hong Kong I helped her buy a local SIM associated with a prepay account with a local telecom company.
On the second day in Hong Kong this lady tripped, landed on her face on concrete and broke her skull and facial bones.
Immediately after the accident I phoned my friend as his brother was a doctor and they were both from Hong Kong originally. I wanted advice from someone who knew about these matters about which hospital to get our friend to. Fortunately his brother called me straight back and together we organised an ambulance to take her to one of the top teaching hospitals in Hong Kong.
Once I knew that my friend was being safely taken care of in hospital I phoned her daughter back home in ANZ and gave her the local Hong Kong phone number of the SIM that she had bought the day before.
As you might expect, with an incident like this there were lots of calls both from the daughter to her mother and (more relevantly) from the mother to her daughter and to her other children.
As a result of all these calls she used up all the available international call minutes allowed for under her plan. Unbeknownst to me when this happened she asked a hospital visitor to go and buy her another SIM card associated with a plan with more international call minutes.
A couple of days later I received a very panicked call from her daughter asking me what was wrong with her mother because she had been trying to call her for days and could never get a call answered.
I told the daughter that her mother was fine and said that I would try and find out what the problem was.
I went to the hospital, talked with my friend and she said that she had no idea why the phone wasn't ringing any more. I checked the settings on her phone and couldn't find an issue and I was very puzzled. I then phoned her while in the same room and noted that her phone did not ring. I also noted that when I called her number I got a message saying that the phone was currently switched off or outside the coverage area.
Still puzzled, I then used her phone to call my number. This worked, even more puzzling until I noticed that the number that came up on my phone was not the number that we had all been calling.
I asked her if anything had changed on her phone (again) and this time she mentioned that she had run out of minutes and so had asked someone to buy her another SIM card
I then explained to my friend that buying another SIM card was unnecessary and very confusing for anyone who had her old phone number because every SIM card is associated with a different phone number. I suggested to my friend that the next time that she ran out of minutes either to contact me or to recharge her existing phone.
That way she could continue to get calls on the phone number that everyone already knew.