There are scout scopes and mounts that replace the leaf rear site. This allows a scope with no permanent modification. Remove it, replace leaf and it is restored, no harm done, no money lost
Drilling and tapping a K98k is not all one needs to do.
The bolt handle must be bent further so yes, buy a peened one that has a good bore if you must or knowingly devalue by huge amounts a good gun.
It is your property and you have every right to lose as much money as you want.
You could just take a few hundred dollar bills and burn them. That may satisfy the desire to lose money, LOL
I did convert three Yugo 24-47 to regular scope mounted guns.
They are easier to do because the straight bolt handle can be bent correctly rather than cutting and welding a M48 bolt as the curve is not easy to get to clear the scope even when bent further.
Also, many M48 have shot out bores being they saw regular service while 24/47s were rebuilt M24s, rebarrled, stored in reserve and then sold as surplus so they usually have like new bores.
I bought 10 and everyone had a new bore and shot great.
Just the hassle of hearing people whine every time you pull out a scoped K98k would be worth avoiding that.
Wulfmann