Most of the anxiety here is about whose name goes where. The rest is shorter than people think.
Traditionally the bride’s parents invite, and the line names them. Couples hosting themselves can simply say so. Both are normal now, and nobody counts it against you.
Name, date, time, venue. The ornamental language belongs on the printed card, if you are printing one. On a phone it gets skimmed.
Half your guest list has not been to a roka. One line explaining it is hospitality, not condescension.
So you do not need the hedging a printed card needs. If a timing is not fixed, say "timing to be confirmed" and change it later.
A sentence saying you need to know by a date, because the caterer needs a number. People respond to a reason.