Any thoughts on this?
It seems all right. If you can't sleep with a foreign broker, then a good Swiss broker should be fine. And since you need a US ETF, I think that Swissqoute is your best bet. I would prefer Swissquote over PostFinance mainly because PF also forces you to have a bank account with them; you can't use them as a broker only.
I had no clue, so thanks! Does it make sense to reinvest my USD dividends from VWRL into VT or are the fees to high?
With Swissquote, small sums are relatively expensive to invest. On the other hand, converting to EUR or CHF is also expensive with them.

I would say it depends on the amount. You should look at the fees to compare the two solutions.