If using an organised tour company that uses the PoiPet/Aranyaprathet crossing then you’re pretty certain to be Ok. They know the wheels to be greased.
It’s you applying for the visa. Not your company. Your company could be worth 300 million dollars but they won’t care. It’s your bank account statement they want to see.
However like any application it will be dependent on the embassy or consulate you are applying at. There may be some that would consider company accounts. I don’t know of any but they may exist.
Absolutely get travel insurance. At 70 it’ll be expensive but is it a risk you’d be prepared to take without it?
Private hospital care here is first class but expensive. Not in the same league as the US but a stay of a few nights can rack up bills of 100,000 baht or more pretty easily.
There’s 100s of cases of “go fund me” posts from people with no insurance or from those that realised that riding their motorbike without a valid licence and IDP for their home country invalidated theirs.
Your call. If you can afford to self insure then insurance is not mandatory.
This is why there there are so many contradictory answers on these forums. Some are asked others are not. Flip a coin. Heads you will be tails you won’t. Or, is it the other way around. I forget.
Irish citizens can arrive in Thailand with no visa and get a stamp for a visa exempt entry for 60 days. That can be extended once for a further 30 days for 1,900 baht at a local immigration office.
Whether you’d have an issue without an onward ticket within the 60 days of initial allowance will be up to your airlines policy.
That’s going to up to your airlines policy. If you don’t have a long term visa then they may deny you boarding without an onward ticket within the days allowed by your entry scheme.
Immigration in Thailand in theory could ask but almost certainly won’t unless you have an extensive history of prior entries and they are looking for a way to deny you entry. If it’s at that stage then even having an onward ticket probably won’t help.