Situation 1.
You have amount of btc (or other crypto) which is close to the price of a hardware wallet. Like 50$ - 100$ current value.
May be you don't need a hardware wallet at all if you are not going to receive more coins.
But consider the following. Bitcoin is not a stable asset. That $100 worth of BTC today can in a bull run go to $200, $500, $1.000...etc. So that magical threshold you have in your head could be crossed before you know it.
Situation 2.
You have some Capital for trading and for short-term (max 1 month) investments into altcoins, new coins, not reliable coins, shitcoins (LOL) etc. May be for transferring forks after you claimed them if you didn't sell them immediately after having got them.
In this situation you need a convenient hardware wallet which enables you to do everything you need to do very quickly and very easy way (in order not to mess up with something and to be able to buy and sell instantly).
...
For example SecuX (probably).
I would never purchase a random hardware wallet for such a purpose. If you are going to invest in one, buy one you feel completely comfortable with using and not just one to hold forks. There are software wallets you can use for such purposes.
Situation 4.
...
But I am not sure about necessity to have 2 wallets in such a situation when it is possible to order and get a new wallet quickly.
If it's a good deal, like some of the Black Friday deals we had in the past where you get your HWs for 50% off, why not. Take into account that HW prices tend to increase, especially now during times of inflation and chip shortage. You might be required to pay more one year from now and wait longer, like what happened during COVID-19 times when they made the world stop spinning.