Adox names FX39-II as a good alternative. They replied to my e-mail about the difference between this and HR-DEV:
The differences in sharpness, grain and effective film speed between HR-DEV and FX-39 II with HR-50 are not so big: Sharpness is about the same, fineness of grain is quite similar. With HR-DEV you get about 1/3 stop more real film speed = better shadow detail compared to FX-39 II.