I started my straight journey by using a Dovo Shavette for a very short time using half DE blades. Then I upgraded to a Feather Artist Club SS using the Feather Pro injector blades, which I used almost 100% for 6 months. I learned to straight shave using the super sharp Feather Pro blades. When I converted to regular straights after those 6 months, there was almost no adjustment because regular straights I found to be more forgiving than the surgically sharp Feather blades.
Looking back at my own experience, if you already have a regular straight, then I see no point to getting a shavette. You can learn using a regular straight.
The main reason for using shavettes is mostly the convenience/cost factor just like Gillette's old safety razor slogan used to say "No stropping, No honing", just replace a blade and shave. No strop, no hone, no nothing. Oh also, almost no joy of the mystique of old fashioned shaving with a real knife blade, no pride of ownership and care of fine equipment, no Zen joy experiencing a new lifelong hobby. Straight shaving is a passionate romance whereas shavette shaving is more like "Wham bam, Thank you sir, Next!!".
Wait for your straight to be honed, then start shaving. Like already commented, you could get a Whipped Dog razor as a 2nd razor, as I did and which I still use and enjoy. Get a strop and some chromium oxide paste. Learn to do careful stropping with occasional blade refreshing with the paste. This will take you a long way down your journey. Enjoy your trip.