Why apply for a tourist visa anyway? It gives you 60 days on entry, but with an Italian passport you’d get that entering with no visa - just a free visa exempt stamp.
You can have a joint account with your wife, but it can be a pain in the backside to use for certain things.
For example if you use it to apply for a visa (and your immigration office allows a joint account) you’ll need double the required funds as they see joint accounts as 50% your money and 50% the other party’s.
Usually way easier to get a separate account for stuff like that.
The UK Embassy doesn’t provide income affidavits so for the first year extension off of a 90 day non O based on being over 50 you cannot use the income method or a combination. It has to be 800k seasoned for two months prior. You need to keep it in the bank for three months after applying and the balance cannot go below 400k for the remainder of the year.
If these conditions are met then the following year you can switch to the income method of having 12x monthly international transfers of over 65k (or if your immigration office allows, a combination).
I’ll let others comment on time for KL or Cambodia to process.
Just to say that as of Jan 1st Laos embassies and consulates switch to e-visa too and there are no appointments available before then for walk in anymore.
Ok let’s lock this down. From other responses here it appears you may have a British passport. If that’s the case then you don’t need a visa for a 40 day visit. On arrival you’d get a 60 day visa exempt stamp.