Reality check for seed generation

After the coldcard mess I decided I dont want to put my trust entirely of Trezors rng either and plan on generating my own seed. Im looking for confirmation that Im not about to do anything stupid.

I plan on following the first 2 steps for dice rolling binary generation and converting it into the first 23 words as described here https://selfcustodylabs.com/docs/learn/keys/random/

After that, I plan on using Ian colemans standalone html on an old laptop with a fresh windows instalation and obviously no internet connection to enter the binary generated, in order to double check if I made any mistakes in the mnemonic for the 23 words. Additionaly, the main purpose of this, is for colemans tool to calculate the 24th checksum word for me.

After that, I intend on wiping the disk of the laptop fully.

Yes, I could use Raspberry Pi to calculate the checksum on my own, and yes, I could use linux Tails for the auto wipe of the PC, but im looking at the best possible option without going full on shizo paranoid mode and overcomplicating things to the point of not being entirely sure what Im doing.

Opinions?

Additional question: Generating seed in this way is random enough to not be susceptible to any hacks like the one with Coldcard, so I assume that a passphrase is also an unnecessary risk of self custody, discounting the case of someone actually finding my seed, correct?