Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .

...and what's $200 - $300? If I even succeed or don't?
probably damn near a proper bore and hone job from a machine shop, tbh.

success wise? you'll succeed in making something that appears to be workable but is way out of spec. so you'll have wasted time, energy and money. and then you'll still have to pay a machine shop to correct your mistakes and make it useable-- that's provided you didn't wreck the block in the first place.

i don't know about you, but in my world time, money and energy are precious commodities. i also don't like paying for things twice. but you do you.