Permanent moon mod

[yepkade]

are there any mods that allow you to unlock the moons permanently so after you buy it you do not have to keep buying it

[Jack Demon]

https://www.youtube.com/watch?v=gymNQtJL8x8

[Hadradavus]

If by "just let me go to the hard moons whenever I want", there's a bunch of options, but I personally use Cheaper Fuel Company since it's very straightforward. That mod specifically still says you need to pay to go to the moons, but you don't.
As for "turn the route to Rend/Dine/Titan wager into a permanent unlock", however, I can't find anything that does that. The closest hit I could find was "Permanent Moons", which just makes it free to go back to there in a quota where you route to it (e.g. pay to go to Titan day 1 -> day 2 it's eclipsed so you go elsewhere -> day 3 go back to Titan when there's no weather for free)
If you want to keep in the spirit of what you want to do, best bet is to first go when you have the money legitimately with one of the free route mods, then buy an equivalent value of items (e.g. a jetpack for Titan, a zap gun and 4 spray cans for Dine) there and leave it behind on the surface when you leave. It'll be all honor-based, but it's the closest you can probably get.

[(TTV)OnBrandRP]

https://thunderstore.io/c/lethal-company/p/BULLETBOT/Permanent_Moons/

This effectively does it buy making all moons cost $0 to go to.

[Saobie]

You can also use MikesTweaks if you have it installed to modify the cost of routing to each moon. You can decrease the cost to 0. You can also add a cost to going to other moons i think, but thats probably exactly what you dont want