On your 1st Q: depends on how damaged it is and you are good at DIY.
On Q #2: I have not much knowledge on modern stuff, but I would think it depends on what kind of freehub it is and what spacing it uses.
Concerning 3rd Q: it doesn't sound like you overspent on the RIH, unless the cassette and wheel repair is going to set you back a couple hundreds
Not so likely I would think.
The RIH Mistral is a bike by RIH Covee of Limburg, The Netherlands. Dutch RIHs were made in Amsterdam (the originals), Groningen (small series by Fongers) and Venlo, Limburg (acquired the rights on the name in the early 70s). Amsterdam RIH is still crafting fine frames, but is renamed RIH-Sport nowadays. Sadly it is unsure whether they will be allowed to use the name in future.
To confuse matters even more: there also exist an Austrian Rih
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