[THIN] Citrix Network Technology Possibilties

I have a customer site a rural town in the Upper Peninsula of Michigan
where I have real dilemma.
 
The not-so-pretty facts:
1) No DSL or Cable provider
2) No local dialup or ISDN internet service
 
There are 3.5 (1 is part-time) users at this site who use a Citrix
published desktop (they run primarily MS Office and a custom
client/server app).  I ended up going with a 56K frame relay circuit. 
This is proving to be very slow and expensive (now appx $700
USD/month).
 
I have heard that 2 way satellite latency is just too high for Citrix
applications. Is that still the case?  Any technology or options that I
haven't considered worth looking at?
 
Thanks in advance for assistance.
 

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