The doctor at Plume is ignoring the science.
Patches allow the estradiol to be absorbed through the skin and stored in the fatty tissue below. Injections bypass the skin and deliver it directly into the fatty tissue (assuming subcutaneous injections). There is no difference in clot risk. The risk comes from oral, not sublingual, because the digestive system first processes it in the liver. That is what affects clotting.
The real risk with injections, per my Endo, is a higher peak dose. You bypass the first-pass effect in the liver; however, once the hormone enters the bloodstream, it is processed by the liver. So, a higher blood dose can increase the risk. My Endo has suggested going back to patches (not happening), or decreasing the dose, and maybe changing injections from once a week to twice a week to avoid the high peaks.
My gynecologist in SD had a similar concern, so she changed my injections to once every ten days without decreasing the dose. I explained this to my current Endo and told him I do not want to change anything without evidence. I have no history of blood clots (me or my family), and I refuse to go back to patches.
He agreed to wait until September and review my labs between now and then. I know he is going to be looking for what he considers "high" peaks, but that also ignores basic biology. I am a fast metabolizer, per my Primary doctor, so my body eliminates some drugs very quickly before they can have the desired effects. The healthcare system seems to want my levels below 200, and when they see a peak of 400, they freak out. They ignore the fact that many cis-women have levels that peak over 400-600. During pregnancy, they can go over 1,000, and you don't see very many pregnant women having blood clots and strokes unless they have a history.
In the past, when I have argued this, they have admitted that I am correct and have changed to complaining about my progesterone dose. I tell them it is the same situation, and if they are that concerned, then take me off oral progesterone and let me have progesterone injections. They can't. (The VA does not have it in its formulary for available prescriptions.) So they back off until the next check-up.
It is like they feel they need to constantly tweak stuff. I tell them it ain't broke, so stop fixing it. I will let you know if I have any symptoms. For now, leave it alone.
I'll see if I can find the research I used to support my position.
Good luck.