If you want to see them get their canon powers, you just have to come up with reasons why they'd volunteer to be experimented on by a Psion rather than do anything else.
They have already been experimented on.
By two Psions, who may or may not have access to some of the records of what was done to X'hal, and who had fine-tuned their process by working on other Tamaraneans before them.
Yes, Fon and his colleague may not have had the time to run the full battery of tests and experiments that they wanted to, but they have done some, as evidenced by the previous update:
And the Universe 16 versions of Komand'r and Koriand'r. They're barely conscious as the drone-platforms they're strapped to float into the main laboratory, though I can see Komand'r's eyes fluttering as she tries to focus. They're both naked, and I can see dried blood-. Some of their wounds are neat, possibly from the Psion's 'investigations'. The rest, a little older, look like blunt object impacts and.. weapon burns. And some-.
All that it requires is that the full effects come on slowly, unlike the sudden event that was the activation of their powers in canon.
If you're not going for drama, there is no reason why the activation of a set of superpowers has to be a sudden event, rather than something that takes place over weeks or months. Superman took the best part of several decades to acquire his superpowers under a yellow sun.
Hell, given that Fon specifically references a relationship to solar radiation as necessary for the subject, it might just be a requirement for the sisters to get out of the artificial, sunless lab and under an actual yellow/red sun for their process to complete and have their altered biology draw power from the Bleed to power their new abilities.
If they'd been empowered already then either they'd have wrecked the facility or they'd be dead.
This is a secure experimental facility that was successfully shielded against Lantern scanning.
Wouldn't the Psions be shielding this place with as many safety measures as they could think to prevent untoward accidents?
They have experience with X'hal after all, and are too cold-blooded to take unnecessary personal risks.
I mean, all the Tamaraneans we've seen in here have been walking, despite flight being a native ability.