I don't understand why voting machines can't just print your vote on a piece of paper behind a plastic window for you to see while also recoding the vote in a database. That is 100% anonymous and can't be cheated. The database is the instant answer at election closing time, and then you can take some days to count the papers as confirmation that nothing weird happened.
No way to hack that. If you print something different on the paper the voter will see it. If you try to hack it by printing more papers than actual votes, the paper count won't match the amount of voting passes that you collected/verified when letting people into the polling station.
It may even be safer than the current paper approach, because if the paper vote counters try to cheat their counts won't match the database triggering an investigation as well.
If it's counted electronically from the database, the piece of paper is completely worthless. Unless you can get the entire voting population to give you their paper and then count them, you will never know if the count is right. If a hacker switched 15% of the vote from one party to another, how could you tell from a piece of paper that tells you who you voted for?
The national elections in NLD have a single ballot in the whole country, with 10+ parties who each get a column of their candidates on the ballot, and with one box for each of the candidates. In these elections for the 150 seats of parliament, often there are 200+ candidates listed total. As a result, the ballot sheets need to be quite large and so are quite far into the 'unwieldy' part of the handling spectrum.
This size issue also complicates verification and counting, because you have to verify that of all checkboxes, exactly one is filled in, and sorting/counting needs to do this for practically every ballot.
There has been some experimenting with changing the ballot to a 'party' and 'list number' ballot, where you fill in the party of your chosen candidate together with their number on the party list, but AFAIK that has not (yet?) been approved for wider use.
Paper voting worked for thousands of years and was at the core of the foundation of this country.
There is no need to compromise the results of the election just to scale in a slightly more efficient way. If you need 10x more people because the volume is 10x higher, just hire 10x more people.