Ouch, that’s kind of slighting.

While it might have worked in Lepanto days, it’s probably not the best idea now since it’s no longer the “accepted” version. It’s kind of like inviting someone over for dinner, but you shoo them out after the salad course because you don’t want to spend
that much time hanging out with them. Not to mention, don’t you think it’s a good idea to ask Mary to pray for us now and at the hour of our death? That’s the kind of request I’d feel very foolish about deliberately omitting.
Are you talking about wanting to shorten a daily 5-decade, a 15-decade, or a 20-decade rosary? Rather than chopping up the prayers, if you don’t feel you have enough time to do 15 or 20 decades a day justice, do a proper 5-decade rosary and focus on making it a worthy prayer. Back in the pre-Luminous mystery days, we did M=J, T=S, W=G, T=J, F=S, S&S=G, but nowadays they do M=J, T=S, W=G, T=L, F=S, S=J, S=G.
If you don’t have 15, 20 min to do a 5-decade rosary in one sitting, try splitting it up through the course of a day. It takes about 3, 4 min per decade. If you can’t find 3 or 4 consecutive minutes to set aside totally for prayer, you can still pray a decade while walking from your car to your office, or while waiting in line somewhere, or while doing mindless housecleaning.
Good luck!