Pick from the Pack
Uighurs are sufficiently far enough away from metropolitan Chinese society that they don't feel near the heat that say, Falun Gong or other movements that the Chinese internal security forces figure might catch on in the Han population. AFAIK the Hui don't proselytize much and keep to themselves.
Other factors keep the PRC from antagonizing them, as they try to keep Pakistan onside as their buddy and try not to appear to actively anti-Muslim, just interested in maintaining domestic order by squishing all opponents.
Unlike the Stalinist repressions in Russia, the Maoists didn't go on quite the rampage against Chinese Buddhist and Taoist temples and religious figures that the Soviets did in the USSR. It didn't hurt that the Muslims never seriously opposed the Communists during the Civil War and many Hui fought in the PLA, so Muslim mosques and clergy were largely left alone. The Maoists preserved the structures as part of Chinese cultural heritage and felt that people would grow out of such superstitious stuff and pursued a live and let live relationship with clergy and religious groups that didn't oppose the regime AFTER the Cultural Revolution, where any deviation from Maoist doctrine was anathema.
Christian missionaries have historically been considered Trojan horses for European colonization in thought as well as Chinese territory, so that's why Christian missionaries get hassled as vigorously as they are in China.
I don't excuse it, that's just why it happens.
So as to the Hui being radicalized, you have to give them a serious bitch with the powers-that-be, a clear cadre of leadership making that bitch known in the ulemma and organizing domestically and abroad to oppose the regime. You could have a crazy Muslim cult spring up that ends up getting crushed like the Davidians in Waco or Aum Shirinkyo in Japan but I don't see a mass movement springing up.
One problem with that is that the Chinese whatever their political flavor historically do NOT tolerate anyone close agitating against their regime.
A separate Muslim enclave that tried actual defiance would be stomped so hard it'd make Tibet look like a day in the park, atrocities be damned and NOBODY in the area would feel froggy enough to oppose it. The Russians wouldn't. They've got enough issues with Muslims in the Near Abroad as it is, and might invade the local stan's to "restore order" as well. Pakistan's isolated enough as it is and needs the Chinese as a counterweight to India and wouldn't say boo.
The US might make some vague noises about it being a shame but I don't see us going to war over it, especially if the Chinese authorities frame the Hui activists as terrorists.
The Hui know this and don't want to test that theory. They're making money and getting by like everyone else in China. When everyone else in China gets hassled, then they might join the movement, but it won't be Muslim-only IMO. YMMV. Keep in mind, enough Uighur and Hui have traveled and seen what it's
like in Tazhikstan, Afghanistan, etc and figure they've got a much better deal in PRC, but hey, when you've convinced yourself anything short of living by sharia
is unacceptable, then you might see some activism.